Investments and Derivative Instruments Level 4 Derivative Collateral Arrangements (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Mar. 31, 2013
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	$ 49,064,000,000		$ 55,838,000,000	$ 55,838,000,000
Derivative, Fair Value, Net	(446,000,000)		(460,000,000)
Security Owned and Pledged as Collateral, Fair Value	40,000,000		16,000,000
Securities Received as Collateral	80,000,000		83,000,000
Fair Value of Securities Received as Collateral that Can be Resold or Repledged	80,000,000		83,000,000
Securities Received as Collateral, Amount Repledged and Sold	0	$ 0
Fixed Maturities [Member]
Derivative Collateral Arrangements [Line Items]
Security Owned and Pledged as Collateral, Fair Value	936,000,000		900,000,000
Equity Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	120,000,000		422,000,000
Derivative, Fair Value, Net	(1,000,000)		1,000,000
UNITED STATES | GMWB Hedging Instruments [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	11,732,000,000		14,442,000,000
Derivative, Fair Value, Net	134,000,000		174,000,000
UNITED STATES | GMWB Hedging Instruments [Member] | Other Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	6,493,000,000		7,041,000,000
Derivative, Fair Value, Net	116,000,000		124,000,000
UNITED STATES | GMWB Hedging Instruments [Member] | Equity Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	1,719,000,000		3,761,000,000
Derivative, Fair Value, Net	10,000,000		39,000,000
UNITED STATES | GMWB Hedging Instruments [Member] | Interest Rate Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	3,520,000,000		3,640,000,000
Derivative, Fair Value, Net	$ 8,000,000		$ 11,000,000