| NOTE 8. Pension and Postretirement Benefit Plans | ||||||||||||||||||
| Components of net periodic benefit cost and other supplemental information for the three and six months ended June 30 follow: | ||||||||||||||||||
| Benefit Plan Information | ||||||||||||||||||
| Three months ended June 30, | ||||||||||||||||||
| Qualified and Non-qualified | ||||||||||||||||||
| Pension Benefits | Postretirement | |||||||||||||||||
| United States | International | Benefits | ||||||||||||||||
| (Millions) | 2009 | 2008 | 2009 | 2008 | 2009 | 2008 | ||||||||||||
| Service cost | $ | 46 | $ | 48 | $ | 24 | $ | 31 | $ | 13 | $ | 13 | ||||||
| Interest cost | 155 | 149 | 55 | 66 | 24 | 25 | ||||||||||||
| Expected return on plan assets | (226 | ) | (222 | ) | (61 | ) | (80 | ) | (23 | ) | (26 | |||||||
| Amortization of transition (asset) obligation | — | — | — | 1 | — | — | ||||||||||||
| Amortization of prior service cost (benefit) | 4 | 4 | (1 | ) | (1 | ) | (20 | ) | (25 | |||||||||
| Amortization of net actuarial (gain) loss | 24 | 14 | 11 | 10 | 16 | 16 | ||||||||||||
| Net periodic benefit cost (benefit) | $ | 3 | $ | (7 | ) | $ | 28 | $ | 27 | $ | 10 | $ | 3 | |||||
| Settlements, curtailments and special termination benefits | 25 | 1 | 1 | — | — | — | ||||||||||||
| Net periodic benefit cost (benefit) after settlements, curtailments and special termination benefits | $ | 28 | $ | (6 | ) | $ | 29 | $ | 27 | $ | 10 | $ | 3 | |||||
| Six months ended June 30, | ||||||||||||||||||
| Qualified and Non-qualified | ||||||||||||||||||
| Pension Benefits | Postretirement | |||||||||||||||||
| United States | International | Benefits | ||||||||||||||||
| (Millions) | 2009 | 2008 | 2009 | 2008 | 2009 | 2008 | ||||||||||||
| Service cost | $ | 92 | $ | 96 | $ | 48 | $ | 62 | $ | 26 | $ | 26 | ||||||
| Interest cost | 310 | 298 | 111 | 132 | 48 | 51 | ||||||||||||
| Expected return on plan assets | (453 | ) | (444 | ) | (123 | ) | (160 | ) | (46 | ) | (52 | |||||||
| Amortization of transition (asset) obligation | — | — | 1 | 2 | — | — | ||||||||||||
| Amortization of prior service cost (benefit) | 8 | 8 | (2 | ) | (2 | ) | (40 | ) | (46 | |||||||||
| Amortization of net actuarial (gain) loss | 49 | 28 | 21 | 20 | 33 | 32 | ||||||||||||
| Net periodic benefit cost (benefit) | $ | 6 | $ | (14 | ) | $ | 56 | $ | 54 | $ | 21 | $ | 11 | |||||
| Settlements, curtailments and special termination benefits | 25 | 1 | 1 | — | — | — | ||||||||||||
| Net periodic benefit cost (benefit) after settlements, curtailments and special termination benefits | $ | 31 | $ | (13 | ) | $ | 57 | $ | 54 | $ | 21 | $ | 11 | |||||