Investments (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
The scheduled maturities of available for sale fixed maturities
Fixed maturities amortized cost, One year or less	$ 904
Fixed maturities fair value, One year or less	922
Fixed maturities fair value, One year or less, Percent	3.00%
Fixed maturities amortized cost, After one year through five years	4,672
Fixed maturities fair value, After one year through five years	5,037
Fixed maturities fair value, After one year through five years, Percent	19.00%
Fixed maturities amortized cost, After five years through ten years	7,383
Fixed maturities fair value, After five years through ten years	7,714
Fixed maturities fair value, After five years through ten years, Percent	28.00%
Fixed maturities amortized cost, After ten years	3,660
Fixed maturities fair value, After ten years	3,757
Fixed maturities fair value, After ten years, Percent	14.00%
Fixed maturities amortized cost, Subtotal	16,619
Fixed maturities fair value, Subtotal	17,430
Fixed maturities fair value, Subtotal, Percent	64.00%
Fixed maturities amortized cost, ABS	2,737
Fixed maturities fair value, ABS	2,760
Fixed maturities fair value, ABS, Percent	10.00%
Fixed maturities amortized cost, MBS	6,628
Fixed maturities fair value, MBS	7,200
Fixed maturities fair value, MBS, Percent	26.00%
Fixed Maturity [Member]
The scheduled maturities of available for sale fixed maturities
Amortized Cost	25,984	25,366
Fair Value	$ 27,390	$ 26,456
Fair value, Total, Percent	100.00%