Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 2,184	$ 1,760	$ 2,281	$ (472)
Adoption of accounting standards	2,184	2,442	2,281	(472)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	940	863	1,078	3,667
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	65	5	219	25
Income tax expense (benefit)	157	176	165	728
Other comprehensive income (loss) attributable to NCI	(14)		(81)
Ending balance	2,888	2,442	2,888	2,442
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		2,349		(628)
Adoption of accounting standards		3,242		(628)
Ending balance		3,242		3,242
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3,444		3,102
Adoption of accounting standards	3,908		3,102
Other comprehensive income (loss) attributable to NCI	10		(82)
Ending balance	3,908		3,908
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(702)		0
Adoption of accounting standards	(101)		(101)
Ending balance	(101)		(101)
DAC, DSI, VOBA, future policy benefits and dividends payable to policyholders adjustments on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(873)	(661)	(879)	121
Adoption of accounting standards	(1,098)	(969)	(1,098)	121
Ending balance	(1,098)	(969)	(1,098)	(969)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	320	77	61	39
Adoption of accounting standards	176	175	61	39
Ending balance	176	175	176	175
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	(14)		(4)
Accumulated Foreign Currency Adjustment and Other Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(5)	(5)	(3)	(4)
Adoption of accounting standards	3	(6)	(3)	(4)
Ending balance	3	(6)	3	(6)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		1,132		4,889
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		7		35
Income tax expense (benefit)		232		984
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	646		1,403
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	85		306
Income tax expense (benefit)	107		213
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	768		(116)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0		0
Income tax expense (benefit)	153		(23)
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]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(306)	(392)	(358)	(1,391)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(20)	(2)	(87)	(10)
Income tax expense (benefit)	(61)	(82)	(58)	(291)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(178)	124	140	171
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Income tax expense (benefit)	(42)	26	33	35
Accumulated Foreign Currency Adjustment and Other Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	10	(1)	9	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Income tax expense (benefit)	0	$ 0	0	$ 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	(8)		8
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	$ (2)		$ (3)
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]
Adoption of accounting standards					$ (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]
Adoption of accounting standards					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]
Adoption of accounting standards					0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 [Member] | Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of accounting standards					(6)
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]
Adoption of accounting standards					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]
Adoption of accounting standards					$ (4)