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Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Adjustments Required To Reconcile Core Earnings [Line Items] |  |  |  |
Net income (loss) | $ 153 | $ 83 | $ 281 | $ 210
Net tax effect | (41) | (30) | (78) | (64)
Operating Segments [Member] |  |  |  |
Adjustments Required To Reconcile Core Earnings [Line Items] |  |  |  |
Net income (loss) | 175 | 131 | 312 | 238
Net tax effect | (53) | (39) | (93) | (72)
Total Adjustments [Member] | Adjustments [Member] |  |  |  |
Adjustments Required To Reconcile Core Earnings [Line Items] |  |  |  |
Net income (loss) | (22) | (48) | (31) | (28)
Core Earnings adjustments to GAAP | (34) | (57) | (46) | (36)
Net tax effect | 12 | 9 | 15 | 8
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member] |  |  |  |
Adjustments Required To Reconcile Core Earnings [Line Items] |  |  |  |
Core Earnings adjustments to GAAP | (23) | (51) | (28) | (20)
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member] | Adjustments [Member] |  |  |  |
Adjustments Required To Reconcile Core Earnings [Line Items] |  |  |  |
Core Earnings adjustments to GAAP | $ (11) | $ (6) | $ (18) | $ (16)

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