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Accumulated Other Comprehensive Income (Loss) - Reclassification of Component of Accumulated Other Comprehensive Income (Loss) Associated with Cash Flow Hedges (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other, net                 $ (50) $ (7) $ (29)
Operating revenues $ 3,460 $ 3,548 $ 3,425 $ 3,176 $ 3,246 $ 3,360 $ 3,315 $ 3,040 13,609 12,961 13,996
Income (loss) before income taxes                 1,822 1,060 1,751
Tax (provision) benefit                 (642) (308) (413)
Total reclassifications for the period, Net of tax $ 334 $ 304 $ 286 $ 256 $ 273 $ 337 $ 273 $ (131) 1,180 752 1,338
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) before income taxes                 (31) 35 8
Tax (provision) benefit                 12 (14) (3)
Total reclassifications for the period, Net of tax                 (19) 21 5
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense, net                 (10) (12) (10)
Treasury Rate Locks [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense, net                 (1) (4) (1)
Foreign Currency Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other, net                 $ (20) $ 51 27
Electricity Commodity Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Operating revenues                     $ (8)