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Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost $ (1,204) $ (224) $ (5,910)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (28) (127) 3,040
Total Incurred but Not Recognized (1,232) (351) (2,870)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts 938 1,109 806
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts [1] (230) (243) (89)
Total Reclassification Adjustment for Prior Period Amounts Recognized [1] 708 866 717
Qualified defined benefit pension plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (1,236) (291) (5,505)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (54) (18) 2,959
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts 879 1,034 758
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts [1] (235) (235) (87)
Retiree medical and life insurance plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 94 46 (160)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 27 (102) (3)
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts 22 28 15
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts [1] 14 2 3
Other Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (62) 21 (245)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (1) (7) 84
Actuarial (gains) and losses - Recognition of Previously Deferred Amounts 37 47 33
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts [1] $ (9) $ (10) $ (5)
[1] Reflects the reclassification for discontinued operations presentation of benefits related to former IS&GS salaried employees ($9 million in 2016, $16 million in 2015 and $11 million in 2014). In addition, we recognized $134 million of prior service credits from the divestiture of our IS&GS business, which were reclassified as discontinued operations.