XML 148 R126.htm IDEA: XBRL DOCUMENT v3.6.0.2
Employee Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plans [Member]      
Components Of Net Periodic Benefit Cost      
Service cost $ 177 $ 188 $ 152
Interest cost 211 195 197
Expected return on plan assets (266) (223) (208)
Prior service cost (credit) and transition obligation (asset) amortization (5) (4) (5)
Actuarial loss (gain) amortization 175 234 158
Net periodic benefit cost 292 390 294
Net actuarial gain (loss) arising during the year (270) (146) (719)
Net actuarial loss (gain) amortized during the year 175 234 158
Net prior service cost (credit) and transition obligation (asset) amortized during the year (5) (4) (5)
Total recognized in other comprehensive income (loss) (100) 84 (566)
Total recognized in net periodic benefit cost and other comprehensive income (loss) (392) (306) (860)
Postretirement Welfare Plan [Member]      
Components Of Net Periodic Benefit Cost      
Interest cost 3 3 3
Expected return on plan assets (1) (1) (1)
Prior service cost (credit) and transition obligation (asset) amortization (3) (3) (3)
Actuarial loss (gain) amortization (4) (4) (6)
Net periodic benefit cost (5) (5) (7)
Net actuarial gain (loss) arising during the year 15 4 (14)
Net actuarial loss (gain) amortized during the year (4) (4) (6)
Net prior service cost (credit) and transition obligation (asset) amortized during the year (3) (3) (3)
Total recognized in other comprehensive income (loss) 8 (3) (23)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 13 $ 2 $ (16)