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Derivative Instruments (Cumulative Basis Adjustments For Fair Value Hedges) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Fixed Maturity AFS Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amortized cost of the hedged assets | $ 738 | $ 824
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets | 187 | 271
Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amortized cost of the hedged liabilities | (815) | (900)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged liabilities | 60 | (25)
Discontinued Hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative fair value hedging adjustment included in the amortized cost of the hedged liabilities | $ (367) | $ (370)

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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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