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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 22	$ 20
Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,229	49,548
Financing Receivable, Allowance for Credit Loss	22	20
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4,709	7,404
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	490	197
Available-for-sale Securities	$ 56,426	$ 56,735
% of Total	100.00%	100.00%
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 32,916	$ 31,963
Available-for-sale Securities	$ 35,295	$ 36,208
% of Total	100.00%	100.00%
Corporate Debt Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 32,916	$ 31,963
Financing Receivable, Allowance for Credit Loss	16	17
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,683	4,356
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	288	94
Available-for-sale Securities	$ 35,295	$ 36,208
% of Total	62.50%	63.90%
Canadian and Canadian provincial governments | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,253	$ 3,145
Financing Receivable, Allowance for Credit Loss	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,423	1,995
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3	0
Available-for-sale Securities	$ 4,673	$ 5,140
% of Total	8.30%	9.10%
Residential mortgage-backed securities | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,536	$ 1,735
Financing Receivable, Allowance for Credit Loss	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	62	84
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	7	2
Available-for-sale Securities	$ 1,591	$ 1,817
% of Total	2.80%	3.20%
Asset-backed Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,156	$ 3,099
Financing Receivable, Allowance for Credit Loss	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	25	35
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	30	42
Available-for-sale Securities	$ 3,151	$ 3,092
% of Total	5.60%	5.40%
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,774	$ 1,790
Financing Receivable, Allowance for Credit Loss	1	3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	78	102
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	11	21
Available-for-sale Securities	$ 1,840	$ 1,868
% of Total	3.30%	3.30%
US Treasury and Government [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 960	$ 1,242
Financing Receivable, Allowance for Credit Loss	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	23	196
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	53	1
Available-for-sale Securities	$ 930	$ 1,437
% of Total	1.60%	2.50%
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,240	$ 1,237
Financing Receivable, Allowance for Credit Loss	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	109	157
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	14	4
Available-for-sale Securities	$ 1,335	$ 1,390
% of Total	2.40%	2.40%
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 7,394	$ 5,337
Financing Receivable, Allowance for Credit Loss	5	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	306	479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	84	33
Available-for-sale Securities	$ 7,611	$ 5,783
% of Total	13.50%	10.20%

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