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Accumulated Other Comprehensive Loss - Reclassification (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | $ (8) | $ (50) | $ (7)
Income before income taxes |  |  |  |  |  |  |  |  | 2,191 | 1,822 | 1,060
Tax (expense) benefit |  |  |  |  |  |  |  |  | (242) | (642) | (308)
Consolidated net income | $ 903 | $ 388 | $ 361 | $ 297 | $ 334 | $ 304 | $ 286 | $ 256 | 1,949 | 1,180 | 752
Derivative Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (12) | (31) | 35
Tax (expense) benefit |  |  |  |  |  |  |  |  | 5 | 12 | (14)
Consolidated net income |  |  |  |  |  |  |  |  | (7) | (19) | 21
Derivative Instruments [Member] | Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (11) | (10) | (12)
Derivative Instruments [Member] | Treasury Lock [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | $ (1) | (1) | (4)
Derivative Instruments [Member] | Foreign Currency Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  |  | $ (20) | $ 51

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