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Investments Investments (Entities That Calculate Net Asset Value Per Share) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 3,200 $ 3,263
Alternative Investment 6,770 4,921
Financial [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 237 329
Alternative Investment $ 673 $ 611
Financial [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 2 years 2 years
Financial [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 10 years 10 years
Real Estate Funds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 598 $ 422
Alternative Investment $ 805 $ 712
Real Estate Funds [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 2 years 2 years
Real Estate Funds [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 11 years 11 years
Distressed Alternative Investments [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 970 $ 80
Alternative Investment $ 358 $ 263
Distressed Alternative Investments [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 2 years 2 years
Distressed Alternative Investments [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 8 years 8 years
Private Credit Alternative Investments [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 270 $ 272
Alternative Investment $ 88 $ 104
Private Credit Alternative Investments [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 3 years 3 years
Private Credit Alternative Investments [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 8 years 8 years
Private Equity Funds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 1,125 $ 2,160
Alternative Investment $ 4,519 $ 2,844
Private Equity Funds [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 2 years 2 years
Private Equity Funds [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 14 years 14 years
Vintage Alternative Investments [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 0 $ 0
Alternative Investment $ 73 $ 116
Vintage Alternative Investments [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 1 year 1 year
Vintage Alternative Investments [Member] | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 2 years 2 years
Investment Funds Alternative Investments [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 0 $ 0
Alternative Investment $ 254 $ 271