Fair Value Measurements (Details - Level 3 roll forwards) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	$ 53	$ (224)	$ 33	$ (245)
Changes In Level 3 Separate Account Assets [Abstract]
Beginning Balance	952	644	750	594
Policyholder gains (losses)	21	23	48	101
Purchases	30	111	230	226
Sales	0	(10)	0	(51)
Settlements	(20)	(18)	(49)	(111)
Purchases, sales, settlements	10	83	181	64
Transfers into/(out of) Level 3:
Transfers into Level 3	2	4	7	4
Transfers out of Level 3	0	(1)	(1)	(10)
Total transfers into/(out of) Level 3	2	3	6	(6)
Ending Balance	985	753	985	753
Guaranteed Minimum Income Benefits Liabilities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(1,332)	(917)	(1,333)	(903)
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	131	(483)	98	(531)
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	131	(483)	98	(531)
Gains or losses included in other comprehensive income	0	0	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0	0	0
Purchases	0	0	0	0
Sales		0		0
Settlements	17	16	51	50
Total purchases, sales, settlements	17	16	51	50
Transfers into/(out of) Level 3:
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Total transfers into/(out of) Level 3	0	0	0	0
Ending balance	(1,184)	(1,384)	(1,184)	(1,384)
Total gains (losses) included in income attributable to instruments held at the reporting date	131	(483)	98	(531)
Guaranteed Minimum Income Benefits Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(625)	(427)	(621)	(423)
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	53	(224)	33	(245)
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	53	(224)	33	(245)
Gains or losses included in other comprehensive income	0	0	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0	0	0
Purchases	0	0	0	0
Sales		0		0
Settlements	13	8	29	25
Total purchases, sales, settlements	13	8	29	25
Transfers into/(out of) Level 3:
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Total transfers into/(out of) Level 3	0	0	0	0
Ending balance	(559)	(643)	(559)	(643)
Total gains (losses) included in income attributable to instruments held at the reporting date	53	(224)	33	(245)
Fixed Maturities And Equity Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	1,128	950	1,002	933
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	0	0	0	0
Other	1	(2)	4	5
Total gains (losses) included in shareholders' net income	1	(2)	4	5
Gains or losses included in other comprehensive income	11	(1)	16	7
Gains or losses required to adjust future policy benefits for settlement annuities	(15)	34	(19)	39
Purchases	39	9	106	58
Sales		(1)		(1)
Settlements	(15)	(3)	(44)	(34)
Total purchases, sales, settlements	24	5	62	23
Transfers into/(out of) Level 3:
Transfers into Level 3	36	33	155	52
Transfers out of Level 3	(4)	(12)	(39)	(52)
Total transfers into/(out of) Level 3	32	21	116	0
Ending balance	1,181	1,007	1,181	1,007
Total gains (losses) included in income attributable to instruments held at the reporting date	2	(2)	2	4
Guaranteed Minimum Income Benefits Assets [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	707	490	712	480
Gains (losses) included in shareholders' net income:
GMIB fair value gain/(loss)	(78)	259	(65)	286
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	(78)	259	(65)	286
Gains or losses included in other comprehensive income	0	0	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0	0	0
Purchases	0	0	0	0
Sales		0		0
Settlements	(4)	(8)	(22)	(25)
Total purchases, sales, settlements	(4)	(8)	(22)	(25)
Transfers into/(out of) Level 3:
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Total transfers into/(out of) Level 3	0	0	0	0
Ending balance	625	741	625	741
Total gains (losses) included in income attributable to instruments held at the reporting date	$ (78)	$ 259	$ (65)	$ 286