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Accumulated Other Comprehensive Loss - Reclassification (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding derivatives | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0
Reclassifications for the period, before tax |  |  |  |  |  |  |  |  | 2,105 | 2,376 | 2,191
Reclassifications for the period, net of tax | $ 447 | $ 495 | $ 382 | $ 347 | $ 531 | $ 498 | $ 499 | $ 395 | 1,671 | 1,923 | 1,949
Derivative Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassifications for the period, before tax |  |  |  |  |  |  |  |  | 11 | 11 | 12
Reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | $ 8 | $ 8 | $ 7

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