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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income (loss) to net income, tax expense (benefit) | $ (4) | $ 8 | $ 8
Net unrealized gains (losses) on securities still held, tax expense (benefit) | 4 | 8 | (5)
Reclassification from accumulated other comprehensive income (loss) to net income, tax expense (benefit) | 1 | (1) | (1)
Net gain (loss) and prior service benefit (cost), tax expense (benefit) | 11 | (14) | (5)
Reclassification from accumulated other comprehensive income (loss) to net income, tax expense (benefit) | (1) | (1) | (1)
Net unrealized gains (losses) on foreign currency translation, tax expense (benefit) | 0 | 0 | 0
Other comprehensive income (loss) related to equity method investee, tax expense (benefit) | 1 | 0 | 1
AOCI Impacts of NEP Deconsolidation, tax | 0 | 0 | 15
Impact on Disposal, Tax | $ (19) | $ 0 | $ 0

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- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32262-110900 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30755-110894 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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