Derivatives - Fair Value Hedges - Non-qualifying Strategies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total other non-qualifying derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives		$ (5)
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	$ (204)	34
Not Designated as Hedging Instrument | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(212)	22
Not Designated as Hedging Instrument | GMWB Product Derivatives [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	65	39
Not Designated as Hedging Instrument | GMWB Reinsurance [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(5)	(13)
Not Designated as Hedging Instrument | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(46)	(22)
Not Designated as Hedging Instrument | Macro Hedge Program [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(226)	18
Not Designated as Hedging Instrument | Foreign Currency Swaps and Forwards [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	0	(3)
Not Designated as Hedging Instrument | Fixed Annuity Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(4)	20
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(4)	17
Not Designated as Hedging Instrument | Interest rate swaps, swaptions and futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	30	(30)
Not Designated as Hedging Instrument | Credit Risk Contract [Member] | Credit derivatives that purchase credit protection
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	0	0
Not Designated as Hedging Instrument | Credit Risk Contract [Member] | Credit derivatives that assume credit risk
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	6	(1)
Not Designated as Hedging Instrument | Equity index options
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	0	0
Not Designated as Hedging Instrument | Other Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	(24)	26
Not Designated as Hedging Instrument | Total other non-qualifying derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-qualifying foreign currency derivatives	$ 12	$ (5)