|
Benefit or Income Cost Related to Pension and Postretirement Health Care and Life Insurance Plans (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
|
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Remeasurement gain, net | $ (237) | $ (237) | ||
|
Pension
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | 82 | 98 | 163 | 197 |
| Amortization of prior service cost (credit) | (2) | 2 | (4) | 3 |
| Expected return on plan assets | (295) | (311) | (590) | (622) |
| Interest cost | 259 | 251 | 518 | 501 |
| Remeasurement gain, net | (237) | (237) | ||
| Net periodic benefit (income) cost | 44 | (197) | 87 | (158) |
|
Health Care And Life
|
||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Service cost | 64 | 79 | 129 | 159 |
| Amortization of prior service cost (credit) | (64) | (61) | (127) | (123) |
| Expected return on plan assets | (40) | (36) | (81) | (72) |
| Interest cost | 277 | 274 | 554 | 548 |
| Net periodic benefit (income) cost | $ 237 | $ 256 | $ 475 | $ 512 |