Fair Value Measurements (Details - Changes in Level 3) (General Accounts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
GMIB Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1,	$ (1,333)	$ (903)
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	96	(504)
Other	0	0
Total gains (losses) included in shareholders' net income	96	(504)
Gains (losses) included in other comprehensive income	0	0
Gains (losses) required to adjust future policy benefits for settlement annuities	0	0
Purchases, issuances, settlements:
Purchases	0	0
Sales	0	0
Settlements	67	74
Total purchases, sales, and settlements	67	74
Transfers into/(out of) Level 3:
Transfer into Level 3	0	0
Transfers out of Level 3	0	0
Transfers into/(out of) Level 3	0	0
Balance at December 31,	(1,170)	(1,333)
Total gains (losses) included in income attributable to instruments held at the reporting date	96	(504)
GMIB Net [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1,	(621)	(423)
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	41	(234)
Other	0	0
Total gains (losses) included in shareholders' net income	41	(234)
Gains (losses) included in other comprehensive income	0	0
Gains (losses) required to adjust future policy benefits for settlement annuities	0	0
Purchases, issuances, settlements:
Purchases	0	0
Sales	0	0
Settlements	32	36
Total purchases, sales, and settlements	32	36
Transfers into/(out of) Level 3:
Transfer into Level 3	0	0
Transfers out of Level 3	0	0
Transfers into/(out of) Level 3	0	0
Balance at December 31,	(548)	(621)
Total gains (losses) included in income attributable to instruments held at the reporting date	41	(234)
Fixed Maturities And Equity Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at January 1,	1,002	933
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	0	0
Other	13	10
Total gains (losses) included in shareholders' net income	13	10
Gains (losses) included in other comprehensive income	8	7
Gains (losses) required to adjust future policy benefits for settlement annuities	(10)	41
Purchases, issuances, settlements:
Purchases	188	129
Sales	(1)	(20)
Settlements	(88)	(61)
Total purchases, sales, settlements	99	48
Transfers into/(out of) Level 3:
Transfers into Level 3	283	81
Transfers out of Level 3	(44)	(118)
Total transfers into/(out of) Level 3	239	(37)
Balance at December 31,	1,351	1,002
Total gains (losses) included in income attributable to instruments held at the reporting date	(1)	6
GMIB Assets [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at January 1,	712	480
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	(55)	270
Other	0	0
Total gains (losses) included in shareholders' net income	(55)	270
Gains (losses) included in other comprehensive income	0	0
Gains (losses) required to adjust future policy benefits for settlement annuities	0	0
Purchases, issuances, settlements:
Purchases	0	0
Sales	0	0
Settlements	(35)	(38)
Total purchases, sales, settlements	(35)	(38)
Transfers into/(out of) Level 3:
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Total transfers into/(out of) Level 3	0	0
Balance at December 31,	622	712
Total gains (losses) included in income attributable to instruments held at the reporting date	$ (55)	$ 270