Derivatives and Hedging Activities (Income Statement) (Details 2) - Derivatives not designated as hedging instruments [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net investment income [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	$ 1
Net investment income [Member] | Interest rate contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income		$ (1)
Net investment income [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	1
Net investment income [Member] | Foreign exchange contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income		1
Banking and deposit interest expense [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	1	(7)
Banking and deposit interest expense [Member] | SMC embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(1)	7
Distribution expenses [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	32	(114)
Distribution expenses [Member] | Interest rate contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(1)	2
Distribution expenses [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	33	(116)
Interest credited to fixed accounts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	11	64
Interest credited to fixed accounts [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	25	(112)
Interest credited to fixed accounts [Member] | IUL embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(9)	164
Interest credited to fixed accounts [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(5)	12
Benefits, claims, losses and settlement expenses [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(530)	2,006
Benefits, claims, losses and settlement expenses [Member] | Interest rate contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(1,825)	2,515
Benefits, claims, losses and settlement expenses [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(310)	1,993
Benefits, claims, losses and settlement expenses [Member] | Credit contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	69	(36)
Benefits, claims, losses and settlement expenses [Member] | Foreign exchange contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	11	44
Benefits, claims, losses and settlement expenses [Member] | GMWB and GMAB embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	1,600	(2,513)
Benefits, claims, losses and settlement expenses [Member] | Structured annuity embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(75)	3
General and administrative expense [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	2	(19)
General and administrative expense [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	6	(16)
General and administrative expense [Member] | Foreign exchange contracts [Member]
Impact of derivatives not designated as hedging instruments on Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	$ (4)	$ (3)