Investments (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
The scheduled maturities of available for sale fixed maturities
Fixed maturities amortized cost, One year or less	$ 886
Fixed maturities fair value, One year or less	904
Fixed maturities fair value, One year or less, Percent	3.00%
Fixed maturities amortized cost, After one year through five years	4,631
Fixed maturities fair value, After one year through five years	4,966
Fixed maturities fair value, After one year through five years, Percent	19.00%
Fixed maturities amortized cost, After five years through ten years	7,287
Fixed maturities fair value, After five years through ten years	7,497
Fixed maturities fair value, After five years through ten years, Percent	28.00%
Fixed maturities amortized cost, After ten years	3,603
Fixed maturities fair value, After ten years	3,562
Fixed maturities fair value, After ten years, Percent	14.00%
Fixed maturities amortized cost, Subtotal	16,407
Fixed maturities fair value, Subtotal	16,929
Fixed maturities fair value, Subtotal, Percent	64.00%
Fixed maturities amortized cost, ABS	2,477
Fixed maturities fair value, ABS	2,493
Fixed maturities fair value, ABS, Percent	9.00%
Fixed maturities amortized cost, MBS	6,482
Fixed maturities fair value, MBS	7,034
Fixed maturities fair value, MBS, Percent	27.00%
Fixed maturity [Member]
The scheduled maturities of available for sale fixed maturities
Amortized Cost	25,366	22,083
Fair Value	$ 26,456	$ 24,118
Fair value, Total, Percent	100.00%