Deferred Acquisition Costs, Deferred Sales Inducements, and Value of Business Acquired - Roll Forward of DAC, DSI, and VOBA (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
DAC
Beginning balance	$ 3,274	$ 3,274	$ 3,921	$ 1,375
Additions		633	645	2,481
Unlocking		(36)	(117)	21
Amortization		(414)	(749)	(108)
Impact of unrealized investment (gains) losses		(233)	(426)	152
Ending balance		3,236	3,274	3,921
DSI
Beginning balance	820	820	799	520
Additions		178	226	264
Unlocking		(13)	(9)	7
Amortization		53	65	61
Impact of unrealized investment (gains) losses		(80)	(131)	69
Ending balance		857	820	799
VOBA
Beginning balance	914	914	1,187	1,077
Additions		0	0	0
Unlocking		(11)	(24)	54
Amortization		(60)	(68)	(141)
Impact of unrealized investment (gains) losses		(35)	(181)	197
Ending balance		813	914	1,187
Total
Beginning balance	5,008	5,008	5,907	2,972
Additions		811	871	2,745
Unlocking		(60)	(150)	82
Amortization		(527)	(882)	(310)
Impact of unrealized investment (gains) losses		(348)	(738)	418
Ending balance		4,906	5,008	5,907
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
DAC	3,274	3,236	3,274	3,921
Deferred Sale Inducement Cost	820	857	820	799
Present Value of Future Insurance Profits, Net	914	813	914	1,187
Deferred Policy Acquisition Costs, Deferred Sales Inducements, and Present Value of Future Profits	5,008	4,906	5,907	5,907
Deferred Policy Acquisition Cost, Capitalization		633	645	2,481
Additions		178	226	264
Additions		0	0	0
Deferred Policy Acquisition Costs, Deferred Sales Inducements, and Present Value of Future Profits, Additions		811	871	2,745
Unlocking		(36)	(117)	21
Unlocking		(13)	(9)	7
Unlocking		(11)	(24)	54
Unlocking		(60)	(150)	82
Deferred Policy Acquisition Cost, Amortization Expense, Other		414	749	108
Amortization		53	65	61
Present Value of Future Insurance Profits, Amortization Expense		60	68	141
Deferred Policy Acquisition Costs, Deferred Sales Inducements, and Present Value of Future Profits, Amortization Expense Excluding Unlocking		527	882	310
Deferred Policy Acquisition Cost, Unrealized Investment Gain (Loss)		233	426	(152)
Deferred Sales Inducement Cost, Unrealized Gain (Loss) on Investment		80	131	(69)
Present Value of Future Insurance Profits, Unrealized Gain (Loss) on Investment		35	181	(197)
Deferred Policy Acquisition Costs, Deferred Sales Inducements, and Present Value of Future Profits, Unrealized Investment Gains (Losses)		$ 348	$ 738	$ (418)
Accounting Standards Update 2016-13 [Member]
DAC
Adoption of accounting standard	12
DSI
Adoption of accounting standard	5
VOBA
Adoption of accounting standard	5
Total
Additions	22
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Deferred Policy Acquisition Costs, Deferred Sales Inducements, and Present Value of Future Profits, Additions	22
Adoption of accounting standard	12
Adoption of accounting standard	5
Adoption of accounting standard	$ 5