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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments [Abstract]  
Summary of investments
 December 31,
20212020
(in millions)
Available-for-Sale securities, at fair value $32,050 $36,283 
Mortgage loans (allowance for credit losses: 2021, $12; 2020, $29)
1,953 2,718 
Policy loans835 846 
Other investments (allowance for credit losses: 2021, $5; 2020, $12)
972 1,184 
Total$35,810 $41,031 
Summary of Net Investment income
 Years Ended December 31,
202120202019
(in millions)
Investment income on fixed maturities$933 $1,161 $1,378 
Net realized gains (losses)636 (10)(8)
Affordable housing partnerships(71)(66)(98)
Other70 89 97 
Consolidated investment entities115 77 94 
Total$1,683 $1,251 $1,463 
Schedule of Available-for-Sale securities by type
Description of SecuritiesDecember 31, 2021
Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
 (in millions)
Corporate debt securities$8,737 $1,243 $(48)$— $9,932 
Residential mortgage backed securities10,927 67 (50)— 10,944 
Commercial mortgage backed securities4,950 59 (23)— 4,986 
Asset backed securities3,639 26 (11)— 3,654 
State and municipal obligations850 244 (1)(1)1,092 
U.S. government and agency obligations1,301 — — — 1,301 
Foreign government bonds and obligations88 5 (1)— 92 
Other securities49 — — — 49 
Total$30,541 $1,644 $(134)$(1)$32,050 
Description of SecuritiesDecember 31, 2020
Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
 (in millions)
Corporate debt securities$11,762 $1,924 $(2)$(10)$13,674 
Residential mortgage backed securities9,845 188 (4)— 10,029 
Commercial mortgage backed securities5,867 242 (21)— 6,088 
Asset backed securities3,283 52 (5)(1)3,329 
State and municipal obligations1,088 297 (1)— 1,384 
U.S. government and agency obligations1,456 — — — 1,456 
Foreign government bonds and obligations241 22 (1)— 262 
Other securities59 2 — — 61 
Total$33,601 $2,727 $(34)$(11)$36,283 
Summary of fixed maturity securities by rating
RatingsDecember 31, 2021December 31, 2020
Amortized
Cost		Fair ValuePercent of Total Fair ValueAmortized
Cost		Fair ValuePercent of Total Fair Value
 (in millions, except percentages)
AAA$20,563 $20,625 64 %$19,815 $20,253 56 %
AA727 898 3 1,082 1,312 3 
A1,775 2,129 7 2,953 3,534 10 
BBB6,495 7,268 23 8,271 9,542 26 
Below investment grade (1)
981 1,130 3 1,480 1,642 5 
Total fixed maturities$30,541 $32,050 100 %$33,601 $36,283 100 %
(1) The amortized cost and fair value of below investment grade securities includes interest in non-consolidated CLOs managed by the Company of $1 million and $2 million, respectively, as of December 31, 2021 and $3 million as of December 31, 2020. These securities are not rated but are included in below investment grade due to their risk characteristics.
Summary of fair value and gross unrealized losses on Available-for-Sale securities in continuous unrealized loss position
Description of SecuritiesDecember 31, 2021
Less than 12 months12 months or moreTotal
Number of SecuritiesFair
Value		Unrealized
Losses		Number of SecuritiesFair
Value		Unrealized
Losses		Number of SecuritiesFair
Value		Unrealized
Losses
 (in millions, except number of securities)
Corporate debt securities110 $2,056 $(43)14 $81 $(5)124 $2,137 $(48)
Residential mortgage backed securities206 5,808 (48)56 191 (2)262 5,999 (50)
Commercial mortgage backed securities102 2,184 (22)9 139 (1)111 2,323 (23)
Asset backed securities41 1,883 (11)6 118 — 47 2,001 (11)
State and municipal obligations26 64 (1)— — — 26 64 (1)
Foreign government bonds and obligations5 6 — 6 4 (1)11 10 (1)
Total490 $12,001 $(125)91 $533 $(9)581 $12,534 $(134)
Description of SecuritiesDecember 31, 2020
Less than 12 months12 months or moreTotal
Number of SecuritiesFair
Value		Unrealized
Losses		Number of SecuritiesFair
Value		Unrealized
Losses		Number of SecuritiesFair
Value		Unrealized
Losses
(in millions, except number of securities)
Corporate debt securities26 $228 $(1)11 $19 $(1)37 $247 $(2)
Residential mortgage backed securities
72 833 (2)71 391 (2)143 1,224 (4)
Commercial mortgage backed securities
35 781 (11)19 393 (10)54 1,174 (21)
Asset backed securities17 344 (3)13 231 (2)30 575 (5)
State and municipal obligations2 4 — 1 4 (1)3 8 (1)
Foreign government bonds and obligations
1 3 — 7 8 (1)8 11 (1)
Total153 $2,193 $(17)122 $1,046 $(17)275 $3,239 $(34)
Rollforward of allowance for credit losses on Available-for-Sale securities
 Corporate Debt SecuritiesAsset Backed SecuritiesState and Municipal ObligationsTotal
(in millions)
Balance at January 1, 2021
$10 $1 $— $11 
Additions for which credit losses were not previously recorded
— — 1 1 
Charge-offs(10)(1)— (11)
Balance at December 31, 2021
$— $— $1 $1 
 Corporate Debt SecuritiesAsset Backed SecuritiesTotal
(in millions)
Balance at January 1, 2020 (1)
$— $— $— 
Additions for which credit losses were not previously recorded
13 1 14 
Additional increases (decreases) on securities that had an allowance recorded in a previous period
(3)— (3)
Balance at December 31, 2020
$10 $1 $11 
(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.
Schedule of net realized gains and losses on Available-for-Sale securities
 Years Ended December 31,
202120202019
(in millions)
Gross realized investment gains$582 $25 $30 
Gross realized investment losses(7)(3)(14)
Credit losses(1)(11)(22)
Other impairments(13)— — 
Total$561 $11 $(6)
Schedule of Available-for-Sale securities by contractual maturity
 Amortized CostFair Value
(in millions)
Due within one year$1,884 $1,892 
Due after one year through five years2,125 2,231 
Due after five years through 10 years3,283 3,359 
Due after 10 years3,733 4,984 
 11,025 12,466 
Residential mortgage backed securities10,927 10,944 
Commercial mortgage backed securities4,950 4,986 
Asset backed securities3,639 3,654 
Total$30,541 $32,050