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Investments - Unrealized Capital Losses (Details)
$ in Millions
Sep. 30, 2019
USD ($)
securities
Dec. 31, 2018
USD ($)
securities
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value $ 1,608 $ 9,733
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 24 359
More Than Twelve Months Below Amortized Cost, Fair Value 1,045 2,392
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 76 201
Total, Fair Value 2,653 12,125
Total Unrealized Capital Losses $ 100 $ 560
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position, Number of Securities | securities 318,000,000 1,894,000,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | securities 271,000,000 550,000,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 589,000,000 2,444,000,000
U.S. Treasuries    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value $ 0 $ 0
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 0
More Than Twelve Months Below Amortized Cost, Fair Value 13 15
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 0 0
Total, Fair Value 13 15
Total Unrealized Capital Losses 0 0
State, municipalities and political subdivisions    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 0 191
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 3
More Than Twelve Months Below Amortized Cost, Fair Value 0 88
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 5
Total, Fair Value 0 279
Total Unrealized Capital Losses 0 8
U.S. corporate public securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 175 3,060
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 3 131
More Than Twelve Months Below Amortized Cost, Fair Value 176 535
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 26 50
Total, Fair Value 351 3,595
Total Unrealized Capital Losses 29 181
U.S. corporate private securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 148 1,502
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 3 40
More Than Twelve Months Below Amortized Cost, Fair Value 97 579
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 17 66
Total, Fair Value 245 2,081
Total Unrealized Capital Losses 20 106
Foreign corporate public securities and foreign governments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 24 1,159
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 54
More Than Twelve Months Below Amortized Cost, Fair Value 92 169
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 11 26
Total, Fair Value 116 1,328
Total Unrealized Capital Losses 11 80
Foreign corporate private securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 73 1,504
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 2 77
More Than Twelve Months Below Amortized Cost, Fair Value 183 221
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 6 20
Total, Fair Value 256 1,725
Total Unrealized Capital Losses 8 97
Residential mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 695 560
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 11 11
More Than Twelve Months Below Amortized Cost, Fair Value 103 412
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 4 21
Total, Fair Value 798 972
Total Unrealized Capital Losses 15 32
Commercial mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 99 865
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 0 16
More Than Twelve Months Below Amortized Cost, Fair Value 5 312
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 0 12
Total, Fair Value 104 1,177
Total Unrealized Capital Losses 0 28
Other asset-backed securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value 394 892
Available-for-sale Securities, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Accumulated Loss 5 27
More Than Twelve Months Below Amortized Cost, Fair Value 376 61
More Than Twelve Months Below Amortized Cost, Unrealized Capital Loss 12 1
Total, Fair Value 770 953
Total Unrealized Capital Losses $ 17 $ 28