Derivatives and Hedging Activities (Income Statement) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net investment income [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	$ (1)	$ (34)	$ 10
Net investment income [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1)	(34)	12
Net investment income [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1)	0	0
Net investment income [Member] | Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1	0	(2)
Banking and deposit interest expense [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	2	0
Banking and deposit interest expense [Member] | SMC embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1)	(9)	4
Banking and deposit interest expense [Member] | Indexed Annuity
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0
Banking and deposit interest expense [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1	11	(4)
Distribution expenses [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	103	99	(42)
Distribution expenses [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	2
Distribution expenses [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	100	99	(42)
Distribution expenses [Member] | Derivatives not designated as hedging instruments [Member] | Credit contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1
Distribution expenses [Member] | Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income		0	0
Interest credited to fixed accounts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	58	(31)	17
Interest credited to fixed accounts [Member] | IUL embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	7	(140)	63
Interest credited to fixed accounts [Member] | Indexed annuity embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(4)	(8)
Interest credited to fixed accounts [Member] | Indexed Annuity
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income			3
Interest credited to fixed accounts [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	55	117	(49)
Benefits, Claims, Losses and Settlement Expenses [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(869)	(988)	(382)
Benefits, Claims, Losses and Settlement Expenses [Member] | GMWB and GMAB embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1,553)	(435)	(377)
Benefits, Claims, Losses and Settlement Expenses [Member] | Indexed Annuity
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(91)
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1,633	1,097	(312)
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(744)	(1,547)	302
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [Member] | Credit contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(106)	(73)	7
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(8)	(30)	1
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [Member] | Other contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	0	(3)
General and administrative expense [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	25	15	(16)
General and administrative expense [Member] | Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	15	16	(7)
General and administrative expense [Member] | Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	$ 10	$ (1)	$ (9)