Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 01, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 3,971	$ 2,281
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,021	(1,174)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(2,630)	(4,273)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(8)	156
Income tax expense (benefit)	(496)	(797)
Other comprehensive income (loss) attributable to NCI	176	183
Ending balance	2,021	(1,174)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5,338	3,102
Accumulated Other Comprehensive Income (Loss), Net of Tax	5,338	3,102
Other comprehensive income (loss) attributable to NCI	175	159
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(39)	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(39)	0
DAC, DSI, VOBA, future policy benefits and dividends payable to policyholders adjustments on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,310)	(879)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,310)	(879)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(26)	61
Accumulated Other Comprehensive Income (Loss), Net of Tax	(26)	61
AOCI, Accumulated Gain (Loss), Debt Securities, with credit allowance, portion attributable to NCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) attributable to NCI	0	0
Accumulated Foreign Currency Adjustment and Other Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	8	(3)
Accumulated Other Comprehensive Income (Loss), Net of Tax	8	(3)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,883	(1,540)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(3,271)	(5,762)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(10)	171
Income tax expense (benefit)	(631)	(1,128)
Ending balance	2,883	(1,540)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(104)	(224)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(81)	(273)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Income tax expense (benefit)	(16)	(53)
Ending balance	(104)	(224)
Deferred Acquisition Costs, Deferred Value of Business Acquired and Future Policy Benefit Adjustment on Available-for-sale Securities Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) attributable to NCI	0	0
Accumulated Net Investment Gain (Loss), Including Deferred Acquisition Costs, Deferred Sales Inducements, Value of Business Acquired, Future Policy Benefits, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(717)	195
Other Comprehensive Income (Loss), before Reclassifications, before Tax	753	1,352
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	(15)
Income tax expense (benefit)	158	287
Ending balance	(717)	195
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(49)	395
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(31)	401
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Income tax expense (benefit)	(7)	97
Ending balance	(49)	395
Accumulated Foreign Currency Adjustment and Other Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	8	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	9
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Income tax expense (benefit)	0	0
Ending balance	8	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) attributable to NCI	1	30
Accumulated Foreign Currency Adjustment and Other Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) attributable to NCI	$ 0	$ (6)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (6)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | DAC, DSI, VOBA, future policy benefits and dividends payable to policyholders adjustments on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(6)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | Accumulated Foreign Currency Adjustment and Other Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			4
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (4)