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Investments (Investments in Fixed Maturity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 17	$ 20
Fixed maturity securities, available-for-sale	59,289	56,735
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	326	197
Available for Sale at Fair value - Amortized cost	54,347	49,548
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19	10	660
Funds Held Under Reinsurance Agreements Asset Specific Client	4,700
Accounts Receivable, Allowance for Credit Loss	$ 1	$ 2
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	100.00%	100.00%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 17	$ 20
Fixed maturity securities, available-for-sale	59,289	56,735
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5,285	7,404
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	326	197
Available for Sale at Fair value - Amortized cost	$ 54,347	$ 49,548
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
% of Total	100.00%	100.00%
Fixed maturity securities, available-for-sale	$ 37,329	$ 36,208
Available for Sale at Fair value - Amortized cost	$ 34,331	$ 31,963
Corporate Debt Securities [Member] | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	62.90%	63.90%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 12	$ 17
Fixed maturity securities, available-for-sale	37,329	36,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,196	4,356
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	186	94
Available for Sale at Fair value - Amortized cost	34,331	31,963
Canadian and Canadian provincial governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 4,724	$ 5,140
Canadian and Canadian provincial governments | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	8.00%	9.10%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Fixed maturity securities, available-for-sale	4,724	5,140
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,447	1,995
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3	0
Available for Sale at Fair value - Amortized cost	3,280	3,145
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 1,209	$ 1,817
Residential mortgage-backed securities | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	2.00%	3.20%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Fixed maturity securities, available-for-sale	1,209	1,817
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	50	84
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6	2
Available for Sale at Fair value - Amortized cost	1,165	1,735
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 3,779	$ 3,092
Asset-backed securities | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	6.40%	5.40%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Fixed maturity securities, available-for-sale	3,779	3,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	39	35
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	23	42
Available for Sale at Fair value - Amortized cost	3,763	3,099
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 1,877	$ 1,868
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	3.20%	3.30%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 1	$ 3
Fixed maturity securities, available-for-sale	1,877	1,868
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	89	102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6	21
Available for Sale at Fair value - Amortized cost	$ 1,795	$ 1,790
US Treasury and Government [Member] | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	2.50%	2.50%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Fixed maturity securities, available-for-sale	1,460	1,437
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	31	196
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	21	1
Available for Sale at Fair value - Amortized cost	1,450	1,242
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 1,331	$ 1,390
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	2.20%	2.40%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Fixed maturity securities, available-for-sale	1,331	1,390
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	139	157
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	5	4
Available for Sale at Fair value - Amortized cost	1,197	1,237
Debt Security, Government, Non-US [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	$ 7,580	$ 5,783
Debt Security, Government, Non-US [Member] | Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
% of Total	12.80%	10.20%
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 4	$ 0
Fixed maturity securities, available-for-sale	7,580	5,783
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	294	479
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	76	33
Available for Sale at Fair value - Amortized cost	$ 7,366	$ 5,337

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