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Investments (Continuous Gross Unrealized Losses for Fixed Maturity and Equity Securities Available-For-Sale) (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Total number of securities in an unrealized loss position less than 12 months 4,811 5,321
Total number of securities in an unrealized loss position equal to or greater than 12 months 1,737 1,790
Fixed Maturity Securities    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value $ 67,091 $ 68,339
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,461 2,924
Equal to or Greater than 12 Months Estimated Fair Value 16,053 17,103
Equal to or Greater than 12 Months Gross Unrealized Loss 1,773 1,961
U.S. corporate    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 15,249 16,147
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 570 656
Equal to or Greater than 12 Months Estimated Fair Value 3,480 3,684
Equal to or Greater than 12 Months Gross Unrealized Loss 345 400
U.S. government and agency    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 15,624 13,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 637 760
Equal to or Greater than 12 Months Estimated Fair Value 152 141
Equal to or Greater than 12 Months Gross Unrealized Loss 27 20
Foreign government    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 6,449 6,228
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 275 271
Equal to or Greater than 12 Months Estimated Fair Value 965 924
Equal to or Greater than 12 Months Gross Unrealized Loss 105 114
Foreign corporate    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 10,099 11,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 480 639
Equal to or Greater than 12 Months Estimated Fair Value 6,272 6,127
Equal to or Greater than 12 Months Gross Unrealized Loss 1,023 1,112
RMBS    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 12,886 12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 356 403
Equal to or Greater than 12 Months Estimated Fair Value 2,154 2,618
Equal to or Greater than 12 Months Gross Unrealized Loss 105 141
State and political subdivision    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 2,215 2,636
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 87 114
Equal to or Greater than 12 Months Estimated Fair Value 93 85
Equal to or Greater than 12 Months Gross Unrealized Loss 11 9
ABS    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 2,054 2,702
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 19 33
Equal to or Greater than 12 Months Estimated Fair Value 2,184 2,789
Equal to or Greater than 12 Months Gross Unrealized Loss 96 111
CMBS    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 2,515 2,570
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 37 48
Equal to or Greater than 12 Months Estimated Fair Value 753 735
Equal to or Greater than 12 Months Gross Unrealized Loss 61 54
Equity securities    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 353 301
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 11 23
Equal to or Greater than 12 Months Estimated Fair Value 168 176
Equal to or Greater than 12 Months Gross Unrealized Loss 23 40
Common Stock    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 256 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10 14
Equal to or Greater than 12 Months Estimated Fair Value 9 11
Equal to or Greater than 12 Months Gross Unrealized Loss 1 0
Non-redeemable preferred stock    
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale    
Less than 12 months Estimated Fair Value 97 196
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 9
Equal to or Greater than 12 Months Estimated Fair Value 159 165
Equal to or Greater than 12 Months Gross Unrealized Loss $ 22 $ 40