Other Comprehensive Income - Changes in AOCI by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 6,643
Other comprehensive income (loss) before reclassifications	(187)	$ 169	$ 268
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	15	18	22
Net investment income	269	297	378
Interest expense	(87)	(85)	(89)
Income (loss) before income taxes	477	413	464
Tax (provision) benefit	(58)	(45)	(63)
Total amount reclassified from AOCI, net of tax	11	13	19
Other comprehensive income (loss)	(198)	156	249
Ending balance	6,292	6,643
Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	14	14	23
Net investment income			16
Fair value gains (losses) on FG VIEs	(3)		(15)
Interest expense	1		1
Income (loss) before income taxes	12	14	25
Tax (provision) benefit	(1)	(1)	(6)
Total  AOCI
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	498	342	93
Less: Amounts reclassified from AOCI to:
Ending balance	300	498	342
Total  AOCI | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		0
Less: Amounts reclassified from AOCI to:
Ending balance			0
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	577	352	59
Other comprehensive income (loss) before reclassifications	(184)	189	339
Less: Amounts reclassified from AOCI to:
Total amount reclassified from AOCI, net of tax	18	26	46
Other comprehensive income (loss)	(202)	163	293
Ending balance	375	577	352
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	21	30	55
Net investment income			1
Fair value gains (losses) on FG VIEs	0		0
Interest expense	0		0
Income (loss) before income taxes	21	30	56
Tax (provision) benefit	(3)	(4)	(10)
Net Unrealized Gains (Losses) on Investments with: No Credit Impairment | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		62
Less: Amounts reclassified from AOCI to:
Ending balance			62
Net Unrealized Gains (Losses) on Investments with: Credit Impairment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(30)	48	94
Other comprehensive income (loss) before reclassifications	0	(29)	(62)
Less: Amounts reclassified from AOCI to:
Total amount reclassified from AOCI, net of tax	(6)	(13)	(16)
Other comprehensive income (loss)	6	(16)	(46)
Ending balance	(24)	(30)	48
Net Unrealized Gains (Losses) on Investments with: Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	(7)	(16)	(32)
Net investment income			15
Fair value gains (losses) on FG VIEs	0		0
Interest expense	0		0
Income (loss) before income taxes	(7)	(16)	(17)
Tax (provision) benefit	1	3	1
Net Unrealized Gains (Losses) on Investments with: Credit Impairment | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(62)
Less: Amounts reclassified from AOCI to:
Ending balance			(62)
ISCR on FG VIEs’ Liabilities with Recourse
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(20)	(27)	(31)
Other comprehensive income (loss) before reclassifications	(3)	7	(8)
Less: Amounts reclassified from AOCI to:
Total amount reclassified from AOCI, net of tax	(2)	0	(12)
Other comprehensive income (loss)	(1)	7	4
Ending balance	(21)	(20)	(27)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0
Net investment income			0
Fair value gains (losses) on FG VIEs	(3)		(15)
Interest expense	0		0
Income (loss) before income taxes	(3)	0	(15)
Tax (provision) benefit	1	0	3
ISCR on FG VIEs’ Liabilities with Recourse | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		0
Less: Amounts reclassified from AOCI to:
Ending balance			0
Cumulative Translation Adjustment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(36)	(38)	(37)
Other comprehensive income (loss) before reclassifications	0	2	(1)
Less: Amounts reclassified from AOCI to:
Total amount reclassified from AOCI, net of tax	0	0	0
Other comprehensive income (loss)	0	2	(1)
Ending balance	(36)	(36)	(38)
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0
Net investment income			0
Fair value gains (losses) on FG VIEs	0		0
Interest expense	0		0
Income (loss) before income taxes	0	0	0
Tax (provision) benefit	0	0	0
Cumulative Translation Adjustment | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		0
Less: Amounts reclassified from AOCI to:
Ending balance			0
Cash  Flow  Hedge
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	7	7	8
Other comprehensive income (loss) before reclassifications	0	0	0
Less: Amounts reclassified from AOCI to:
Total amount reclassified from AOCI, net of tax	1	0	1
Other comprehensive income (loss)	(1)	0	(1)
Ending balance	6	7	7
Cash  Flow  Hedge | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0
Net investment income			0
Fair value gains (losses) on FG VIEs	0		0
Interest expense	1		1
Income (loss) before income taxes	1	0	1
Tax (provision) benefit	$ 0	0	0
Cash  Flow  Hedge | Effect of adoption of accounting guidance on credit losses
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		$ 0
Less: Amounts reclassified from AOCI to:
Ending balance			$ 0