Derivatives and Hedging Activities (Income Statement) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net investment income [Member] | Derivatives not designated as hedging instruments [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	$ (13)	$ 2
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	12	(3)	3
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		(10)	(1)
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	(2)
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	4	(4)	(2)
Banking and deposit interest expense [Member] | Derivatives not designated as hedging instruments [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	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	(4)	4	2
Distribution expenses [Member] | Derivatives not designated as hedging instruments [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	(42)	57	22
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	(42)	54	23
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		3	(1)
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	63	(45)	15
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	3
Interest credited to fixed accounts [Member] | Derivatives not designated as hedging instruments [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	17	30	35
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	(49)	75	20
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	(377)	663	237
Benefits, Claims, Losses and Settlement Expenses [Member] | Derivatives not designated as hedging instruments [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	(382)	(464)	(624)
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	(312)	1	36
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	302	(1,081)	(897)
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	7	(22)	2
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	1	(23)
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	(3)	(2)	(2)
General and administrative expense [Member] | Derivatives not designated as hedging instruments [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	(16)	17	20
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	(7)	11	6
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	$ (9)	$ 6	$ 14