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Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - Fixed maturities - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available-for-sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	$ 133	$ 0
Additions to allowance for credit losses not previously recorded	31	158
Reductions for securities sold during the period	(26)
Additions (reductions) on securities with previous allowance	(7)
Balance, ending of period	131	158
Available-for-sale | U.S. Treasury securities and obligations of U.S. government authorities and agencies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Additions to allowance for credit losses not previously recorded	0	0
Reductions for securities sold during the period	0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Available-for-sale | Foreign government bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Additions to allowance for credit losses not previously recorded	0	38
Reductions for securities sold during the period	0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	38
Available-for-sale | U.S. and Foreign Corporate Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	123	0
Additions to allowance for credit losses not previously recorded	31	119
Reductions for securities sold during the period	(26)
Additions (reductions) on securities with previous allowance	(6)
Balance, ending of period	122	119
Available-for-sale | Asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Additions to allowance for credit losses not previously recorded	0	0
Reductions for securities sold during the period	0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Available-for-sale | Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	10	0
Additions to allowance for credit losses not previously recorded	0	1
Reductions for securities sold during the period	0
Additions (reductions) on securities with previous allowance	(1)
Balance, ending of period	9	1
Available-for-sale | Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Additions to allowance for credit losses not previously recorded	0	0
Reductions for securities sold during the period	0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Held-to-maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	9	0
Cumulative effect of adoption of ASU 2016-13		9
Additions (reductions) on securities with previous allowance	(2)
Balance, ending of period	7	9
Held-to-maturity | U.S. Treasury securities and obligations of U.S. government authorities and agencies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Cumulative effect of adoption of ASU 2016-13		0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Held-to-maturity | Foreign government bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Cumulative effect of adoption of ASU 2016-13		0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Held-to-maturity | U.S. and Foreign Corporate Securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	9	0
Cumulative effect of adoption of ASU 2016-13		9
Additions (reductions) on securities with previous allowance	(2)
Balance, ending of period	7	9
Held-to-maturity | Asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Cumulative effect of adoption of ASU 2016-13		0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Held-to-maturity | Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Cumulative effect of adoption of ASU 2016-13		0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	0	0
Held-to-maturity | Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	0	0
Cumulative effect of adoption of ASU 2016-13		0
Additions (reductions) on securities with previous allowance	0
Balance, ending of period	$ 0	$ 0

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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