|
Benefit or Income Cost Related to Pension and Postretirement Health Care and Life Insurance Plans (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
|
Pension
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Service cost | $ 395 | $ 358 | $ 307 |
| Amortization of prior service cost (credit) | 6 | (1) | 72 |
| Subtotal | 401 | 357 | 379 |
| Expected return on plan assets | (1,245) | (1,795) | (1,976) |
| Interest cost | 1,002 | 1,449 | 1,590 |
| Subtotal | 158 | 11 | (7) |
| Remeasurement (gain) loss, net | (2,470) | 5,542 | 4,146 |
| Net periodic benefit (income) cost | (2,312) | 5,553 | 4,139 |
| Curtailment and termination benefits | 4 | ||
| Total | (2,308) | 5,553 | 4,139 |
|
Health Care And Life
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Service cost | 318 | 359 | 299 |
| Amortization of prior service cost (credit) | (247) | (89) | (57) |
| Subtotal | 71 | 270 | 242 |
| Expected return on plan assets | (143) | (171) | (163) |
| Interest cost | 1,095 | 1,284 | 1,421 |
| Subtotal | 1,023 | 1,383 | 1,500 |
| Remeasurement (gain) loss, net | (3,989) | 1,262 | 1,787 |
| Net periodic benefit (income) cost | (2,966) | 2,645 | 3,287 |
| Total | $ (2,966) | $ 2,645 | $ 3,287 |