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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income (loss) to net income, tax expense | $ 8 | $ 8 | $ 13
Net unrealized gains (losses) on securities still held, tax expense (benefit) | 8 | (5) | 94
Reclassification from accumulated other comprehensive income (loss) to net income, tax benefit (less than in 2018) | (1) | (1) | (25)
Net gain (loss) and prior service benefit (cost) tax expense (benefit) (less than for the year ended December 31, 2018) | (14) | (5) | 29
Reclassification from accumulated other comprehensive income (loss) to net income, tax benefit | (1) | (1) | (1)
Net unrealized gains (losses) on foreign currency translation, tax expense (benefit) | 0 | 0 | 1
Other comprehensive income (loss) related to equity method investee, tax | 0 | 1 | 1
AOCI Impacts of NEP Deconsolidation, tax | $ 0 | $ 15 | $ 0

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