Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (DAC and VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net [Abstract]
Beginning Balance of DAC	$ 5,149	$ 5,678	$ 5,652
Capitalizations of DAC	369	322	260
Net investment gains (losses) of DAC and net derivative gains (losses)	204	(384)	258
Other expenses of DAC	(577)	(560)	(445)
Total amortization of DAC	(373)	(944)	(187)
Unrealized investment gains (losses) of DAC	(199)	93	(47)
Ending Balance of DAC	4,946	5,149	5,678
Beginning Balance of VOBA	568	608	641
Net investment gains (losses) of VOBA and net derivative gains (losses)	(1)	(1)	(9)
Other expenses of VOBA	(8)	(105)	(31)
Total amortization of VOBA	(9)	(106)	(40)
Unrealized investment gains (losses) of VOBA	(57)	66	7
Ending Balance of VOBA	502	568	608
Ending Balance of DAC and VOBA	$ 5,448	$ 5,717	$ 6,286