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Changes in Balance of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance [1] $ (11,870) $ (9,601) $ (13,493)
Other comprehensive (loss) income before reclassifications (424) (2,973) 2,879
Amounts reclassified from AOCL      
Recognition of net actuarial losses 1,109 806 973
Amortization of net prior service (credits) costs (259) (100) 42
Other   (2) (2)
Total reclassified from AOCL 850 704 1,013
Other comprehensive income (loss), net of tax 426 (2,269) 3,892
Ending balance [1] (11,444) (11,870) (9,601)
Postretirement Benefit Plan Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance [1] (11,813) (9,649) (13,532)
Other comprehensive (loss) income before reclassifications (351) (2,870) 2,868
Amounts reclassified from AOCL      
Recognition of net actuarial losses 1,109 806 973
Amortization of net prior service (credits) costs (259) (100) 42
Total reclassified from AOCL 850 706 1,015
Other comprehensive income (loss), net of tax 499 (2,164) 3,883
Ending balance [1] (11,314) (11,813) (9,649)
Other, net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance [1] (57) 48 39
Other comprehensive (loss) income before reclassifications (73) (103) 11
Amounts reclassified from AOCL      
Other   (2) (2)
Total reclassified from AOCL   (2) (2)
Other comprehensive income (loss), net of tax (73) (105) 9
Ending balance [1] $ (130) $ (57) $ 48
[1] AOCL related to postretirement benefit plans is shown net of tax benefits at December 31, 2015, 2014 and 2013 of $6.2 billion, $6.4 billion and $5.3 billion. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See Note 9 and Note 11 for more information on our income taxes and postretirement benefit plans.