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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost $ 9,639 $ 10,613
Gross Unrealized Gains 517 344
Gross Unrealized Losses (34) (139)
Fixed-maturity securities 10,122 10,818
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 59 $ 118
Mortgage backed securities consisting of government-agency obligations, percent 42.00% 48.00%
Fixed Maturities [Member]    
Investments    
Percent of Total 87.00% 93.00%
Amortized Cost $ 8,371 $ 9,884
Gross Unrealized Gains 517 344
Gross Unrealized Losses (34) (139)
Fixed-maturity securities 8,854 10,089
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 59 $ 118
Short-term Investments [Member]    
Investments    
Percent of Total 13.00% 7.00%
Amortized Cost $ 1,268 $ 729
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fixed-maturity securities 1,268 729
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0 $ 0
Obligations of state and political subdivisions [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 42.00% 45.00%
Amortized Cost $ 4,036 $ 4,761
Gross Unrealized Gains 305 168
Gross Unrealized Losses (1) (18)
Fixed-maturity securities 4,340 4,911
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 40 $ 40
US Treasury and Government [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 1.00% 2.00%
Amortized Cost $ 137 $ 167
Gross Unrealized Gains 10 9
Gross Unrealized Losses 0 (1)
Fixed-maturity securities 147 175
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0 $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 23.00% 20.00%
Amortized Cost $ 2,137 $ 2,175
Gross Unrealized Gains 103 13
Gross Unrealized Losses (19) (52)
Fixed-maturity securities 2,221 2,136
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ (8) $ (4)
Residential Mortgage-Backed Securities (RMBS) [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 8.00% 9.00%
Amortized Cost $ 745 $ 999
Gross Unrealized Gains 37 17
Gross Unrealized Losses (7) (34)
Fixed-maturity securities 775 982
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 8 $ (15)
Commercial Mortgage Backed Securities (CMBS) [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 4.00% 5.00%
Amortized Cost $ 402 $ 542
Gross Unrealized Gains 17 4
Gross Unrealized Losses 0 (7)
Fixed-maturity securities 419 539
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 0 $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 7.00% 9.00%
Amortized Cost $ 684 $ 942
Gross Unrealized Gains 38 131
Gross Unrealized Losses (2) (5)
Fixed-maturity securities 720 1,068
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 16 $ 97
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total 2.00% 3.00%
Amortized Cost $ 230 $ 298
Gross Unrealized Gains 7 2
Gross Unrealized Losses (5) (22)
Fixed-maturity securities 232 278
AOCI Pre-tax Gain (Loss) on Securities with OTTI $ 3 $ 0