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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |
Tax expense (benefit) on cash flow hedges reclassified from AOCI to net income | $ 1 | $ 2 | $ 3 | $ 5
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held | 3 | (1) | 6 | (3)
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income | (1) | 1 | 1 | (1)
Tax expense (benefit) of defined benefit pension and other benefits plans | (1) | 0 | (16) | (1)
Tax expense (benefit) of defined benefit pension and other benefits plans reclassified from AOCI to net income | 0 | (1) | (1) | (1)
Tax expense (benefit) of other comprehensive income (loss) related to equity method investees | 1 | (1) | (1) | 1
AOCI Impacts of NEP Deconsolidation, tax |  |  |  | $ 15

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