Equity Reclassification AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	$ 6	$ 599	$ 15	$ 663
Investment gains, net	(290)	(131)	(408)	(247)
Salaries and employee benefits	304	292	621	598
Total	159	(2,185)	842	(2,087)
Available-for-Sale Securities [Member] | Gross [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	6		15
Investment gains, net	(115)		(123)
Salaries and employee benefits	0		0
Total	(109)		(108)
Available-for-Sale Securities [Member] | Tax [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	(2)		(5)
Investment gains, net	40		43
Salaries and employee benefits	0		0
Total	38		38
Available-for-Sale Securities [Member] | Net [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	4		10
Investment gains, net	(75)		(80)
Salaries and employee benefits	0		0
Total	(71)		(70)
Accumulated Other Comprehensive Income (Loss), Other [Member] | Gross [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	0		0
Investment gains, net	0		0
Salaries and employee benefits	5		15
Total	5		15
Accumulated Other Comprehensive Income (Loss), Other [Member] | Tax [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	0		0
Investment gains, net	0		0
Salaries and employee benefits	(1)		(5)
Total	(1)		(5)
Accumulated Other Comprehensive Income (Loss), Other [Member] | Net [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net other-than-temporary impairments	0		0
Investment gains, net	0		0
Salaries and employee benefits	4		10
Total	$ 4		$ 10