Derivatives Instruments Level 4 Non-qualifying Strategies for Hedge Accounting (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum Aggregate Principal Amount of Junior Subordinated Notes	$ 0		$ 0
Derivative, Notional Amount	52,010		52,010		$ 56,216
Derivative, Fair Value, Net	(514)		(514)		(1,001)
Put Option [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum Aggregate Principal Amount of Junior Subordinated Notes	0		0
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	10,200		10,200		10,600
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	58		58		68
GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	9,484		9,484		10,256
Derivative, Fair Value, Net	85		85		94
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(40)	$ 42	(87)	$ 13
Derivative, Notional Amount	47,838		47,838		52,537
Derivative, Fair Value, Net	(498)		(498)		(907)
Not Designated as Hedging Instrument [Member] | Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	165		165		1,064
Derivative, Fair Value, Net	0		0		68
Not Designated as Hedging Instrument [Member] | Put Option [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	(1)	(1)	(3)
Derivative, Notional Amount	0		0		500
Derivative, Fair Value, Net	0		0		1
Not Designated as Hedging Instrument [Member] | Macro Hedge Program [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(38)	(20)	(124)	(34)
Derivative, Notional Amount	6,885		6,885		6,532
Derivative, Fair Value, Net	168		168		178
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(17)	82	(6)	121
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(8)	(25)	(10)	(47)
Not Designated as Hedging Instrument [Member] | Equity Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	(5)	(4)	13
Derivative, Notional Amount	321		321		105
Derivative, Fair Value, Net	3		3		0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)	4	6	(20)
Derivative, Notional Amount	10,882		10,882		11,743
Derivative, Fair Value, Net	(485)		(485)		(890)
Not Designated as Hedging Instrument [Member] | Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Invested Assets Suppoting Modco	889		889		875
Not Designated as Hedging Instrument [Member] | GMWB Product Derivatives [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	39	(30)	140	(109)
Derivative, Notional Amount	12,178		12,178		13,114
Derivative, Fair Value, Net	(134)		(134)		(241)
Not Designated as Hedging Instrument [Member] | GMWB Reinsurance [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(6)	1	(24)	13
Derivative, Notional Amount	2,527		2,527		2,709
Derivative, Fair Value, Net	57		57		73
Not Designated as Hedging Instrument [Member] | Credit Default Swap, Buying Protection [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	115		115		209
Derivative, Fair Value, Net	(3)		(3)		(4)
Not Designated as Hedging Instrument [Member] | Credit Default Swap, Selling Protection [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,654		1,654		1,309
Derivative, Fair Value, Net	2		2		10
Not Designated as Hedging Instrument [Member] | Fixed Annuity Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(10)	60	11	96
Not Designated as Hedging Instrument [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(13)	32	(78)	82
Derivative, Notional Amount	9,484		9,484		10,256
Derivative, Fair Value, Net	85		85		94
GMWB Hedging Instruments [Member] | Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	5,102		5,102		5,191
GMWB Hedging Instruments [Member] | Equity Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,383		1,383		1,362
GMWB Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,999		2,999		3,703
Fair Value Hedging [Member] | Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	74		74		100
Fair Value Hedging [Member] | Equity Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	(35)		(35)		(27)
Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net	46		46		21
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(18)	(17)	(86)	(48)
Other Credit Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(5)	(23)	5	(60)
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	41	(2)	30	(7)
Credit Default Swap, Selling Protection [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,621		2,621		$ 2,968
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	(33)	6	(16)	4
Currency Swap [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (7)	$ 22	$ (17)	$ 25