Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	$ 4,411	$ 1,340	$ 138	$ 2,804
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(2)	25	154	20
Income tax expense related to other comprehensive income (loss)	805	261	8	552
Other comprehensive income (loss) attributable to NCI	(250)		(67)
Accumulated other comprehensive income (loss)	2,184	1,760	2,184	1,760	$ (1,174)		$ 2,281	$ 706	$ (472)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)		2,349		2,349				959	(628)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) attributable to NCI	(251)		(92)
Accumulated other comprehensive income (loss)	3,444		3,444		(1,540)		3,102
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(702)		(702)		(224)		0
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)	(873)	(661)	(873)	(661)	195		(879)	(282)	121
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	320	77	320	77	395		61	33	39
Noncredit component of OTTI losses on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before taxes							(25)
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	10		10
Accumulated Foreign Currency Adjustment and Other Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(5)	(5)	(5)	(5)	$ 0		$ (3)	$ (4)	$ (4)
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		1,776		3,757
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		35		28
Income tax expense related to other comprehensive income (loss)		351		752
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	6,519		757
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	50		221
Income tax expense related to other comprehensive income (loss)	1,234		106
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	(611)		(884)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0		0
Income tax expense related to other comprehensive income (loss)	(123)		(176)
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	(1,404)	(490)	(52)	(999)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(52)	(10)	(67)	(8)
Income tax expense related to other comprehensive income (loss)	(284)	(101)	3	(209)
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	(83)	55	318	47
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Income tax expense related to other comprehensive income (loss)	(22)	11	75	9
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)	(1)	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Income tax expense related to other comprehensive income (loss)	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	(14)		16
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	$ 5		$ (1)
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)						$ (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)						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)						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]
Accumulated other comprehensive income (loss)						(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]
Accumulated other comprehensive income (loss)						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)						$ (4)