Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Change in foreign exchange	$ 1		$ 1
Fixed maturities | Available-for-sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	269	$ 192	138	$ 114
Additions to allowance for credit losses not previously recorded	3	13	140	85
Reductions for securities sold during the period	(5)	(25)	(45)	(55)
Reductions for securities with intent to sell		(76)		(80)
Additions (reductions) on securities with previous allowance	9	6	43	45
Reclassified to / (from) “Assets held-for sale”		(1)		0
Balance, ending of period	276	109	276	109
Fixed maturities | 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	0	0
Additions to allowance for credit losses not previously recorded	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Reductions for securities with intent to sell		0		0
Additions (reductions) on securities with previous allowance	0	0	0	0
Reclassified to / (from) “Assets held-for sale”		0		0
Balance, ending of period	0	0	0	0
Fixed maturities | 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	62	12	1	7
Additions to allowance for credit losses not previously recorded	0	1	62	11
Reductions for securities sold during the period	0	0	0	(2)
Reductions for securities with intent to sell		(9)		(13)
Additions (reductions) on securities with previous allowance	(6)	2	(7)	3
Reclassified to / (from) “Assets held-for sale”		0		0
Balance, ending of period	56	6	56	6
Fixed maturities | 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	206	180	136	107
Additions to allowance for credit losses not previously recorded	3	11	78	73
Reductions for securities sold during the period	(5)	(25)	(45)	(53)
Reductions for securities with intent to sell		(67)		(67)
Additions (reductions) on securities with previous allowance	15	4	50	42
Reclassified to / (from) “Assets held-for sale”		(1)		0
Balance, ending of period	219	102	219	102
Fixed maturities | 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	1	0	1	0
Additions to allowance for credit losses not previously recorded	0	1	0	1
Reductions for securities sold during the period	0	0	0	0
Reductions for securities with intent to sell		0		0
Additions (reductions) on securities with previous allowance	0	0	0	0
Reclassified to / (from) “Assets held-for sale”		0		0
Balance, ending of period	1	1	1	1
Fixed maturities | 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	0	0	0	0
Additions to allowance for credit losses not previously recorded	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Reductions for securities with intent to sell		0		0
Additions (reductions) on securities with previous allowance	0	0	0	0
Reclassified to / (from) “Assets held-for sale”		0		0
Balance, ending of period	0	0	0	0
Fixed maturities | 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	0	0
Additions to allowance for credit losses not previously recorded	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Reductions for securities with intent to sell		0		0
Additions (reductions) on securities with previous allowance	0	0	0	0
Reclassified to / (from) “Assets held-for sale”		0		0
Balance, ending of period	0	0	0	0
Fixed maturities | Fixed maturities, held-to-maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Balance, beginning of period	2	4	2	5
Current period provision for expected losses	0	(1)	0	(1)
Change in foreign exchange	0	0	0	(1)
Balance, ending of period	2	3	2	3
Fixed maturities | Fixed maturities, 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	0	0
Current period provision for expected losses	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, ending of period	0	0	0	0
Fixed maturities | Fixed maturities, 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	0	0
Current period provision for expected losses	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, ending of period	0	0	0	0
Fixed maturities | Fixed maturities, 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	2	4	2	5
Current period provision for expected losses	0	(1)	0	(1)
Change in foreign exchange	0	0	0	(1)
Balance, ending of period	2	3	2	3
Fixed maturities | Fixed maturities, 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	0	0
Current period provision for expected losses	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, ending of period	0	0	0	0
Fixed maturities | Fixed maturities, 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	0	0
Current period provision for expected losses	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, ending of period	0	0	0	0
Fixed maturities | Fixed maturities, 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	0	0
Current period provision for expected losses	0	0	0	0
Change in foreign exchange	0	0	0	0
Balance, ending of period	$ 0	$ 0	$ 0	$ 0