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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	$ 660	$ 633
Purchases	58	9
Sales	(3)	(5)
Issuances	0	0
Settlements	(3)	0
Other	(22)	1
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	728	594
Total gains (losses) (realized/unrealized):
Included in earnings	38	(44)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	35	(44)
Equity securities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Equity securities | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	38	(44)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	35	(44)
Equity securities | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Equity securities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Equity securities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	(12)	(47)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(17)	(44)
Assets supporting experience-rated contractholder liabilities | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	2	(3)
Assets supporting experience-rated contractholder liabilities | Foreign government bonds
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	19	24
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	19	24
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | Corporate securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	482	637
Purchases	14	4
Sales	0	(10)
Issuances	0	0
Settlements	(19)	(45)
Other	0	0
Transfers into Level 3	68	63
Transfers out of Level 3	0	0
Fair Value, end of period	538	603
Total gains (losses) (realized/unrealized):
Included in earnings	(7)	(46)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(14)	(44)
Assets supporting experience-rated contractholder liabilities | Structured securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	114	69
Purchases	137	116
Sales	0	0
Issuances	0	0
Settlements	(11)	(4)
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(18)	0
Fair Value, end of period	219	177
Total gains (losses) (realized/unrealized):
Included in earnings	(3)	(4)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(3)	0
Assets supporting experience-rated contractholder liabilities | Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	0	0
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Assets supporting experience-rated contractholder liabilities | All other activity
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	20	0
Purchases	0	7
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	20	7
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	366	567
Purchases	0	27
Sales	0	0
Issuances	0	0
Settlements	0	(1)
Other	0	(20)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	378	581
Total gains (losses) (realized/unrealized):
Included in earnings	12	8
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	13	8
Other invested assets | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	11	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	12	0
Other invested assets | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	1	8
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	1	8
Other invested assets | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Short-term investments
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	177	155
Purchases	256	43
Sales	0	0
Issuances	0	0
Settlements	(10)	(110)
Other	(26)	(37)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	396	53
Total gains (losses) (realized/unrealized):
Included in earnings	(1)	2
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(1)	0
Short-term investments | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(1)	2
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(1)	0
Short-term investments | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Short-term investments | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Short-term investments | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Short-term investments | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Cash equivalents
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1	131
Purchases	3	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	(130)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	4	1
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Cash equivalents | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Cash equivalents | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Cash equivalents | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Cash equivalents | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Cash equivalents | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Other assets
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	268	113
Purchases	12	17
Sales	0	0
Issuances	0	0
Settlements	(3)	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	144	382
Total gains (losses) (realized/unrealized):
Included in earnings	(133)	252
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(133)	252
Other assets | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(133)	252
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(133)	252
Other assets | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other assets | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other assets | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other assets | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Separate accounts assets
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1,821	1,717
Purchases	68	56
Sales	(13)	(13)
Issuances	0	0
Settlements	(6)	(18)
Other	(615)	0
Transfers into Level 3	22	7
Transfers out of Level 3	(14)	(81)
Fair Value, end of period	1,306	1,528
Total gains (losses) (realized/unrealized):
Included in earnings	43	(140)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	36	(128)
Separate accounts assets | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Separate accounts assets | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Separate accounts assets | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	43	(140)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	36	(128)
Separate accounts assets | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Separate accounts assets | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Future policy benefits
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	(18,879)	(12,831)
Purchases	0	0
Sales	0	0
Issuances	(331)	(319)
Settlements	0	0
Other	0	4
Transfers Into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	(11,314)	(27,935)
Total gains (losses) (realized/unrealized):
Included in earnings	7,896	(14,789)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	7,681	(14,923)
Future policy benefits | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	7,896	(14,789)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	7,681	(14,923)
Future policy benefits | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Future policy benefits | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Future policy benefits | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Future policy benefits | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Policyholders' account balances
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	(1,914)	(1,316)
Purchases	0	0
Sales	0	0
Issuances	(122)	(96)
Settlements	0	0
Other	0	0
Transfers Into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	(2,171)	(1,206)
Total gains (losses) (realized/unrealized):
Included in earnings	(135)	206
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(99)	209
Policyholders' account balances | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(135)	206
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(99)	209
Policyholders' account balances | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Policyholders' account balances | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Policyholders' account balances | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Policyholders' account balances | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Other liabilities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0	(105)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers Into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	0	(47)
Total gains (losses) (realized/unrealized):
Included in earnings	0	58
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	58
Other liabilities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other liabilities | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	58
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	58
Other liabilities | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other liabilities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other liabilities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Notes Issued by Consolidated VIEs
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0	(800)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers Into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	0	(799)
Total gains (losses) (realized/unrealized):
Included in earnings	0	1
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Notes Issued by Consolidated VIEs | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	1
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Notes Issued by Consolidated VIEs | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Notes Issued by Consolidated VIEs | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Notes Issued by Consolidated VIEs | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Notes Issued by Consolidated VIEs | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Available-for-sale | Fixed maturities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(28)	(27)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(41)	(27)
Available-for-sale | Fixed maturities | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Available-for-sale | Fixed maturities | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Available-for-sale | Fixed maturities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	(300)	(483)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(301)	(481)
Available-for-sale | Fixed maturities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	2	2
Available-for-sale | Fixed maturities | U.S. government
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	150	105
Purchases	0	10
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	150	115
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Available-for-sale | Fixed maturities | U.S. states
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	4	4
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	4	4
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Available-for-sale | Fixed maturities | Foreign government bonds
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	11	22
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	11	21
Total gains (losses) (realized/unrealized):
Included in earnings	0	(1)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Available-for-sale | Fixed maturities | Corporate securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	5,335	3,236
Purchases	243	294
Sales	0	(113)
Issuances	0	0
Settlements	(177)	(235)
Other	2	1
Transfers into Level 3	219	1,827
Transfers out of Level 3	0	(14)
Fair Value, end of period	5,277	4,496
Total gains (losses) (realized/unrealized):
Included in earnings	(345)	(500)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(361)	(492)
Available-for-sale | Fixed maturities | Structured securities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	543	948
Purchases	219	315
Sales	0	(17)
Issuances	0	0
Settlements	(74)	(100)
Other	12	155
Transfers into Level 3	311	12
Transfers out of Level 3	(200)	(358)
Fair Value, end of period	830	948
Total gains (losses) (realized/unrealized):
Included in earnings	19	(7)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	19	(16)
Trading | Fixed maturities
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	243	287
Purchases	1	18
Sales	(2)	(6)
Issuances	0	0
Settlements	0	0
Other	0	(2)
Transfers into Level 3	0	15
Transfers out of Level 3	0	(48)
Fair Value, end of period	242	249
Total gains (losses) (realized/unrealized):
Included in earnings	0	(15)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	(16)
Trading | Fixed maturities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Trading | Fixed maturities | Other income
Total gains (losses) (realized/unrealized):
Included in earnings	0	(15)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	(16)
Trading | Fixed maturities | Interest credited to policyholders’ account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
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