Derivative Instruments Level 4 Non-qualifying Strategies for Hedge Accounting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 39,644		$ 39,644		$ 41,099
Derivative, Fair Value, Net	(405)		(405)		(475)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	37,810		37,810		39,141
Derivative, Fair Value, Net	(395)		(395)		(466)
Derivative, Gain (Loss) on Derivative, Net	(58)	$ (47)	(139)	$ (28)
Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(50)	(58)	(136)	(106)
Currency Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	37		37		382
Derivative, Fair Value, Net	0		0		36
Swap [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	5,035		5,035		5,191
Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	62		62		100
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	8,157		8,157		6,532
Derivative, Fair Value, Net	166		166		178
Derivative, Gain (Loss) on Derivative, Net	(65)	(64)	(189)	(98)
Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	(1)	(10)	(48)
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net				108
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	12	4	104
Fixed Annuity Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(3)	13	8	109
Equity Contract [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,370		1,370		1,362
Equity Contract [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	(41)		(41)		(27)
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	0		0		100
Derivative, Fair Value, Net	0		0		0
Derivative, Gain (Loss) on Derivative, Net	0	(2)	(4)	30
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	3,240		3,240		2,774
Derivative, Fair Value, Net	(387)		(387)		(411)
Derivative, Gain (Loss) on Derivative, Net	(5)	(3)	3	(11)
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Invested Assets Suppoting Modco	882		882		875
Derivative, Fair Value, Net	57		57		68
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,700		2,700		2,700
Interest Rate Swap [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,986		2,986		3,703
Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	44		44		21
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	11,797		11,797		13,114
Derivative, Fair Value, Net	(93)		(93)		(241)
Derivative, Gain (Loss) on Derivative, Net	58	87	198	(22)
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,450		2,450		2,709
Derivative, Fair Value, Net	51		51		73
Derivative, Gain (Loss) on Derivative, Net	(9)	(15)	(33)	(2)
GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	9,391		9,391		10,256
Derivative, Fair Value, Net	65		65		94
GMWB Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	9,391		9,391		10,256
Derivative, Fair Value, Net	65		65		94
Derivative, Gain (Loss) on Derivative, Net	(34)	(66)	(112)	16
Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	804		804		804
Derivative, Fair Value, Net	(255)		(255)		(263)
Basket Credit Default Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers	1,200		1,200		1,800
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2	(4)	14	(7)
Credit Default Swap, Selling Protection [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	672		672		$ 961
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)	9	(10)	10
Currency Swap [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (1)	$ (1)	$ (4)	$ (5)