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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturity securities - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 8,508	$ 4,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,907	769
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	105	34
Debt Securities, Available-for-sale, Unrealized Loss Position	10,415	4,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	326	197
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	221	163
Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	641	522
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	188	113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	51	15
Debt Securities, Available-for-sale, Unrealized Loss Position	829	635
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	88	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	37	80
Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7,867	3,546
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,719	656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	54	19
Debt Securities, Available-for-sale, Unrealized Loss Position	9,586	4,202
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	238	102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	184	83
Corporate Debt Securities [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	506	375
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	106	81
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31	11
Debt Securities, Available-for-sale, Unrealized Loss Position	612	456
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	61	60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30	49
Corporate Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,789	930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	348	70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18	5
Debt Securities, Available-for-sale, Unrealized Loss Position	4,137	1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	125	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	107	29
Canadian and Canadian provincial governments | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	45	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	45	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	3	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	0
Residential mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	143	294
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	86	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	0
Debt Securities, Available-for-sale, Unrealized Loss Position	229	294
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	6	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	2
Asset-backed securities | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	14	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12	1
Debt Securities, Available-for-sale, Unrealized Loss Position	14	24
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	12	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	13
Asset-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	935	1,096
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	668	570
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	11
Debt Securities, Available-for-sale, Unrealized Loss Position	1,603	1,666
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	11	28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6	17
Commercial mortgage-backed securities | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	91
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	33	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	0
Debt Securities, Available-for-sale, Unrealized Loss Position	33	91
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	15
Commercial mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	75	160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	20	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	0
Debt Securities, Available-for-sale, Unrealized Loss Position	95	160
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	6
US Government Agencies Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	724	27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	724	27
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	21	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21	1
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	110	66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	36	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3	3
Debt Securities, Available-for-sale, Unrealized Loss Position	146	82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	1
Debt Security, Government, Non-US [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	135	36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	35	28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	3
Debt Securities, Available-for-sale, Unrealized Loss Position	170	64
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	11	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	3
Debt Security, Government, Non-US [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,046	973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	561	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	24	0
Debt Securities, Available-for-sale, Unrealized Loss Position	2,607	973
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	65	27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 41	$ 27

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