Condensed Financial Information (Parent Company) (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statements of Cash Flows
Net cash provided by (used in) operating activities	$ 1,348	$ 1,129	$ 2,338
Cash flows from investing activities
Sales, maturities and repayments of fixed maturity securities	12,406	8,322	13,358
Sales, maturities and repayments of equity securities	128	66	57
Sales, maturities and repayments of mortgage loans	2,891	1,929	1,528
Sales, maturities and repayments of limited partnerships and limited liability companies	271	177	302
Purchases of fixed maturity securities	(21,036)	(14,209)	(16,406)
Purchases of equity securities	(18)	(17)	(22)
Purchases of mortgage loans	(6,929)	(2,073)	(3,609)
Purchases of limited partnerships and limited liability companies	(837)	(582)	(463)
Cash received in connection with freestanding derivatives	3,956	6,347	2,040
Cash paid in connection with freestanding derivatives	(4,590)	(4,514)	(2,638)
Receipts on loans to affiliate	0	100	0
Issuances of loans to affiliate	(1)	(100)	0
Net change in policy loans	15	(9)	126
Net change in short-term investments	1,223	(391)	(1,470)
Net change in other invested assets	(24)	30	36
Net cash provided by (used in) investing activities	(12,545)	(4,924)	(7,161)
Cash flows from financing activities
Policyholder account balances: Deposits	15,498	9,565	7,111
Policyholder account balances: Withdrawals	(4,177)	(3,240)	(2,773)
Net change in payables for collateral under securities loaned and other transactions	1,016	863	(673)
Long-term and short-term debt issued	0	100	412
Dividends paid to parent	(550)	(1,250)	0
Financing element on certain derivative instruments and other derivative related transactions, net	(368)	(949)	(203)
Other, net	(1)	(1)	(50)
Net cash provided by (used in) financing activities	11,417	4,986	3,822
Change in cash, cash equivalents and restricted cash	220	1,191	(1,001)
Cash, cash equivalents and restricted cash, beginning of year	3,684	2,493	3,494
Cash, cash equivalents and restricted cash, end of year	3,904	3,684	2,493
Supplemental disclosures of cash flow information
Net cash paid (received) for interest	67	68	30
Net cash paid (received) for income tax	53	(125)	3
Parent Company
Condensed Statements of Cash Flows
Net cash provided by (used in) operating activities	1,368	815	2,160
Cash flows from investing activities
Sales, maturities and repayments of fixed maturity securities	11,647	7,591	12,009
Sales, maturities and repayments of equity securities	107	66	57
Sales, maturities and repayments of mortgage loans	2,814	1,869	1,434
Sales, maturities and repayments of limited partnerships and limited liability companies	271	177	302
Purchases of fixed maturity securities	(18,942)	(12,517)	(14,179)
Purchases of equity securities	(8)	(17)	(22)
Purchases of mortgage loans	(6,680)	(1,993)	(3,337)
Purchases of limited partnerships and limited liability companies	(837)	(581)	(463)
Cash received in connection with freestanding derivatives	3,489	6,035	1,933
Cash paid in connection with freestanding derivatives	(4,471)	(4,284)	(2,597)
Receipts on loans to affiliate	0	100	0
Issuances of loans to affiliate	0	(100)	0
Returns of capital and dividends from subsidiaries	24	16	54
Capital contributions to subsidiaries	0	0	(75)
Net change in policy loans	15	(9)	126
Net change in short-term investments	1,021	(223)	(1,418)
Net change in other invested assets	(33)	22	23
Net cash provided by (used in) investing activities	(11,583)	(3,848)	(6,153)
Cash flows from financing activities
Policyholder account balances: Deposits	14,203	8,568	6,117
Policyholder account balances: Withdrawals	(3,966)	(3,029)	(2,503)
Net change in payables for collateral under securities loaned and other transactions	821	812	(735)
Long-term and short-term debt issued	0	0	412
Dividends paid to parent	(550)	(1,250)	0
Financing element on certain derivative instruments and other derivative related transactions, net	(368)	(957)	(203)
Other, net	0	0	(7)
Net cash provided by (used in) financing activities	10,140	4,144	3,081
Change in cash, cash equivalents and restricted cash	(75)	1,111	(912)
Cash, cash equivalents and restricted cash, beginning of year	3,384	2,273	3,185
Cash, cash equivalents and restricted cash, end of year	3,309	3,384	2,273
Supplemental disclosures of cash flow information
Net cash paid (received) for interest	65	65	28
Net cash paid (received) for income tax	45	(32)	0
Non-cash transactions:
Transfer of fixed maturity securities from affiliate	240	417	0
Transfer of fixed maturity securities to affiliate	$ 722	$ 280	$ 0