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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-Sale Securities Disclosure [Table Text Block]
Available-for-Sale securities distributed by type were as follows:
Description of Securities
September 30, 2020
Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
 (in millions)
Fixed maturities:     
Corporate debt securities$10,338 $1,642 $(33)$(13)$11,934 
Residential mortgage backed securities3,195 122 (2)— 3,315 
Commercial mortgage backed securities4,026 228 (7)— 4,247 
State and municipal obligations1,047 288 (1)— 1,334 
Asset backed securities1,286 42 (2)— 1,326 
Foreign government bonds and obligations245 19 (2)— 262 
U.S. government and agency obligations201 — — — 201 
Total$20,338 $2,341 $(47)$(13)$22,619 
Description of Securities
December 31, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
 (in millions)
Fixed maturities:    
Corporate debt securities$10,188 $1,336 $(2)$11,522 
Residential mortgage backed securities3,039 73 (4)3,108 
Commercial mortgage backed securities3,526 95 (3)3,618 
State and municipal obligations1,071 237 (2)1,306 
Asset backed securities1,036 45 (1)1,080 
Foreign government bonds and obligations250 19 (2)267 
U.S. government and agency obligations1 — — 1 
Total$19,111 $1,805 $(14)$20,902 
Fixed Maturity Securities by Rating Disclosure [Table Text Block]
A summary of fixed maturity securities by rating was as follows:
Ratings
September 30, 2020
December 31, 2019
Amortized CostFair ValuePercent of Total Fair ValueAmortized CostFair ValuePercent of Total Fair Value
 (in millions, except percentages)
AAA$8,030 $8,400 37 %$6,771 $6,950 33 %
AA1,077 1,315 6 1,176 1,374 7 
A2,574 3,118 14 2,695 3,157 15 
BBB7,088 8,152 36 7,709 8,626 41 
Below investment grade1,569 1,634 7 760 795 4 
Total fixed maturities$20,338 $22,619 100 %$19,111 $20,902 100 %
Available-for-Sale Securities Continuous Unrealized Loss Disclosure [Table Text Block]
The following tables provide information about Available-for-Sale securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position:
Description of Securities 
September 30, 2020
Less than 12 months12 months or moreTotal
Number of SecuritiesFair ValueUnrealized LossesNumber of SecuritiesFair Value
Unrealized Losses
Number of SecuritiesFair Value
Unrealized Losses
 (in millions, except number of securities)
Corporate debt securities69 $789 $(29)2 $12 $(4)71 $801 $(33)
Residential mortgage backed securities
21 304 (2)6 10 — 27 314 (2)
Commercial mortgage backed securities
23 428 (5)6 43 (2)29 471 (7)
State and municipal obligations
4 14 (1)1 4 — 5 18 (1)
Asset backed securities
9 139 (1)2 36 (1)11 175 (2)
Foreign government bonds and obligations
6 26 (1)9 10 (1)15 36 (2)
Total132 $1,700 $(39)26 $115 $(8)158 $1,815 $(47)
Description of Securities 
December 31, 2019
Less than 12 months12 months or moreTotal
Number of SecuritiesFair ValueUnrealized LossesNumber of SecuritiesFair ValueUnrealized LossesNumber of SecuritiesFair ValueUnrealized Losses
 (in millions, except number of securities)
Corporate debt securities15 $64 $— 7 $90 $(2)22 $154 $(2)
Residential mortgage backed securities
29 571 (1)20 298 (3)49 869 (4)
Commercial mortgage backed securities
18 310 (1)7 82 (2)25 392 (3)
State and municipal obligations
5 23 — 3 54 (2)8 77 (2)
Asset backed securities10 111 (1)6 54 — 16 165 (1)
Foreign government bonds and obligations
1 — — 10 15 (2)11 15 (2)
Total78 $1,079 $(3)53 $593 $(11)131 $1,672 $(14)
Rollforward of allowance for credit losses on Available-for-Sale Securities [Table Text Block]
The following tables present a rollforward of the allowance for credit losses on Available-for-Sale securities:
Corporate Debt Securities
(in millions)
Balance, July 1, 2020
$13 
Additions for which credit losses were not previously recognized
— 
Balance, September 30, 2020
$13 
Corporate Debt Securities
(in millions)
Balance, January 1, 2020 (1)
$— 
Additions for which credit losses were not previously recognized
13 
Balance, September 30, 2020
$13 
(1) Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.
Net Realized Gains and Losses on Available-for-Sale Securities Disclosure [Table Text Block]
Net realized gains and losses on Available-for-Sale securities, determined using the specific identification method, recognized in net realized investment gains (losses) were as follows:
Three Months Ended
September 30,
Nine Months Ended
September 30,
2020
2019
2020
2019
(in millions)
Gross realized investment gains$2 $6 $12 $28 
Gross realized investment losses— (2)(2)(14)
Credit losses— (15)(13)(15)
Total$2 $(11)$(3)$(1)
Available-for-Sale Securities Contractual Maturity Disclosure [Table Text Block]

Amortized CostFair Value
(in millions)
Due within one year$879 $888 
Due after one year through five years4,348 4,633 
Due after five years through 10 years2,521 2,801 
Due after 10 years4,083 5,409 
11,831 13,731 
Residential mortgage backed securities3,195 3,315 
Commercial mortgage backed securities4,026 4,247 
Asset backed securities1,286 1,326 
Total$20,338 $22,619 
Schedule of Net Investment Income [Table Text Block]

Three Months Ended
September 30,
Nine Months Ended
September 30,
2020
2019
2020
2019
(in millions)
Fixed maturities$191 $205 $585 $644 
Mortgage loans29 29 86 88 
Other investments(3)(6)(9)(2)
217 228 662 730 
Less: investment expenses5 6 15 18 
Total$212 $222 $647 $712