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Investments (Investments in Fixed Maturity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 52,797 | $ 49,548
Financing Receivable, Allowance for Credit Loss | 16 | 20
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,773 | 7,404
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 267 | 197
Estimated Fair Value | $ 58,287 | $ 56,735
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 33,687 | $ 31,963
Estimated Fair Value | $ 37,004 | $ 36,208
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 33,687 | $ 31,963
Financing Receivable, Allowance for Credit Loss | 11 | 17
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,465 | 4,356
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 137 | 94
Estimated Fair Value | $ 37,004 | $ 36,208
% of Total | 63.40% | 63.90%
Canadian and Canadian provincial governments | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,303 | $ 3,145
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,602 | 1,995
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2 | 0
Estimated Fair Value | $ 4,903 | $ 5,140
% of Total | 8.40% | 9.10%
Residential mortgage-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,323 | $ 1,735
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 60 | 84
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6 | 2
Estimated Fair Value | $ 1,377 | $ 1,817
% of Total | 2.40% | 3.20%
Asset-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,467 | $ 3,099
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 36 | 35
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 21 | 42
Estimated Fair Value | $ 3,482 | $ 3,092
% of Total | 6.00% | 5.40%
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities |  |
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 | 102 | 102
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6 | 21
Estimated Fair Value | $ 1,869 | $ 1,868
% of Total | 3.20% | 3.30%
US Treasury and Government [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,295 | $ 1,242
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 47 | 196
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 24 | 1
Estimated Fair Value | $ 1,318 | $ 1,437
% of Total | 2.30% | 2.50%
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,206 | $ 1,237
Financing Receivable, Allowance for Credit Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 144 | 157
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6 | 4
Estimated Fair Value | $ 1,344 | $ 1,390
% of Total | 2.30% | 2.40%
Debt Security, Government, Non-US [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 6,742 | $ 5,337
Financing Receivable, Allowance for Credit Loss | 4 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 317 | 479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 65 | 33
Estimated Fair Value | $ 6,990 | $ 5,783
% of Total | 12.00% | 10.20%

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