Investments and Derivative Instruments (Details 19) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]
Derivative, Notional Amount	$ 159,686		$ 170,851	$ 170,851
Fair Value	(1,481)			(1,548)
Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,749	[1]		3,258	[1]
Fair Value	155			161
Offsetting Notional Amount	1,393	[2]		1,751	[2]
Offsetting Fair Value	6	[2]		9	[2]
Corporate Credit/Foreign Gov. [Member] | Single Name Credit Default Swaps [Member] | Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	297			735
Fair Value	5			6
Weighted Average Years to Maturity	4 years		2 years
Underlying Referenced Credit Obligation Type	Corporate Credit/ Foreign Gov.		Corporate Credit/ Foreign Gov.
Average Credit Rating	A-		A
Offsetting Notional Amount	163			592
Offsetting Fair Value	(3)			(4)
Corporate Credit [Member] | Single Name Credit Default Swaps [Member] | Below Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	24			24
Fair Value	0			0
Weighted Average Years to Maturity	4 months		1 year
Underlying Referenced Credit Obligation Type	Corporate Credit		Corporate Credit
Average Credit Rating	CCC		CCC
Offsetting Notional Amount	24			25
Offsetting Fair Value	0			0
Corporate Credit [Member] | Basket Credit Default Swaps [Member] | Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,881			1,912
Fair Value	22			25
Weighted Average Years to Maturity	3 years		3 years
Underlying Referenced Credit Obligation Type	Corporate Credit		Corporate Credit
Average Credit Rating	BBB+		BBB+
Offsetting Notional Amount	857			784
Offsetting Fair Value	(10)			(10)
Corporate Credit [Member] | Basket Credit Default Swaps [Member] | Below Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	42	[1]		115
Fair Value	3			(18)
Weighted Average Years to Maturity	5 years		3 years
Underlying Referenced Credit Obligation Type	Corporate Credit	[3]	CMBS Credit
Average Credit Rating	B	[3]	B-
Offsetting Notional Amount	0	[2]		115
Offsetting Fair Value	0	[2]		18
Corporate Credit [Member] | Embedded Credit Derivatives [Member] | Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	150			150
Fair Value	145			145
Weighted Average Years to Maturity	3 years		3 years
Underlying Referenced Credit Obligation Type	Corporate Credit		Corporate Credit
Average Credit Rating	A-		BBB+
Offsetting Notional Amount	0			0
Offsetting Fair Value	0			0
CMBS Credit [Member] | Basket Credit Default Swaps [Member] | Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	240			235
Fair Value	(4)			(5)
Weighted Average Years to Maturity	3 years		3 years
Underlying Referenced Credit Obligation Type	CMBS Credit		CMBS Credit
Average Credit Rating	AA-		A
Offsetting Notional Amount	234			235
Offsetting Fair Value	4			5
CMBS Credit [Member] | Basket Credit Default Swaps [Member] | Below Investment Grade Risk Exposure [Member] | Credit [Member]
Derivative [Line Items]
Derivative, Notional Amount	115
Fair Value	(16)
Weighted Average Years to Maturity	3 years
Underlying Referenced Credit Obligation Type	CMBS Credit
Average Credit Rating	B
Offsetting Notional Amount	115
Offsetting Fair Value	$ 15

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjFiYTI4MmM3NDY0MzRiNDhiZGQ1ZGRjYTkwZjZkNmJlfFRleHRTZWxlY3Rpb246NDBBM0Y5RjE4MTQ2RTYzQkMyMDU4OUFDRjE5RjBEMzEM}

[2] The Company has entered into offsetting credit default swaps to terminate certain existing credit default swaps, thereby offsetting the future changes in value of, or losses paid related to, the original swap.

[3] The average credit ratings are based on availability and the midpoint of the applicable ratings among Moody’s, S&P, Fitch, and Morningstar. If no rating is available from a rating agency, then an internally developed rating is used.