Derivatives and Hedging Activities (Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest credited to fixed accounts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	$ 64	$ (35)
Interest credited to fixed accounts [Member] | IUL embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	164	(81)
Interest credited to fixed accounts [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	12	(2)
Benefits, claims, losses and settlement expenses [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	2,006	(230)
Benefits, claims, losses and settlement expenses [Member] | GMWB and GMAB embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(2,513)	148
Benefits, claims, losses and settlement expenses [Member] | Structured annuity embedded derivatives [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	3
Derivatives not designated as hedging instruments [Member] | Interest credited to fixed accounts [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(112)	48
Derivatives not designated as hedging instruments [Member] | Benefits, claims, losses and settlement expenses [Member] | Interest rate contracts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	2,515	332
Derivatives not designated as hedging instruments [Member] | Benefits, claims, losses and settlement expenses [Member] | Equity contracts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	1,993	(675)
Derivatives not designated as hedging instruments [Member] | Benefits, claims, losses and settlement expenses [Member] | Credit contracts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	(36)	(29)
Derivatives not designated as hedging instruments [Member] | Benefits, claims, losses and settlement expenses [Member] | Foreign exchange contracts [Member]
Impact of derivatives not designated as hedging instruments, including embedded derivatives, on the Consolidated Statements of Income
Amount of gain (loss) on derivatives recognized in income	$ 44	$ (6)