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Derivative Instruments (Cumulative Basis Adjustments For Fair Value Hedges) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fixed Maturity AFS Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amortized cost of the hedged assets | $ 890 | $ 776
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets | 328 | 202
Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amortized cost of the hedged liabilities | (954) | (1,035)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged liabilities | (79) | (160)
Discontinued Hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative fair value hedging adjustment included in the amortized cost of the hedged liabilities | $ (381) | $ (118)

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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=109980867&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=109980867&loc=SL109999712-113959 + Details
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