Fair Value Measurements (Details - Level 3 roll forwards) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gains (losses) included in shareholders' net income:
GMIB fain value gain/(loss)	$ (87)	$ (37)	$ (20)	$ (21)
Changes In Level 3 Separate Account Assets [Abstract]
Beginning Balance	943	559	750	594
Policyholder gains (losses)	9	21	27	79
Purchases	16	106	200	115
Sales	0	(1)	0	(41)
Settlements	(18)	(35)	(29)	(94)
Purchases, sales, settlements	(2)	70	171	(20)
Transfers into/(out of) Level 3:
Transfers into Level 3	2	0	5	0
Transfers out of Level 3	0	(6)	(1)	(9)
Total transfers into/(out of) Level 3	2	(6)	4	(9)
Ending Balance	952	644	952	644
Guaranteed Minimum Income Benefits Liabilities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(1,162)	(850)	(1,333)	(903)
Gains (losses) included in shareholders' net income:
GMIB fain value gain/(loss)	(186)	(85)	(33)	(48)
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	(186)	(85)	(33)	(48)
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
Settlements	16	18	34	34
Total purchases, sales, settlements	16	18	34	34
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	(1,332)	(917)	(1,332)	(917)
Total gains (losses) included in income attributable to instruments held at the reporting date	(186)	(85)	(33)	(48)
Guaranteed Minimum Income Benefits Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(545)	(391)	(621)	(423)
Gains (losses) included in shareholders' net income:
GMIB fain value gain/(loss)	(87)	(37)	(20)	(21)
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	(87)	(37)	(20)	(21)
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
Settlements	7	1	16	17
Total purchases, sales, settlements	7	1	16	17
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)	(427)	(625)	(427)
Total gains (losses) included in income attributable to instruments held at the reporting date	(87)	(37)	(20)	(21)
Fixed Maturities And Equity Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	1,072	928	1,002	933
Gains (losses) included in shareholders' net income:
GMIB fain value gain/(loss)	0	0	0	0
Other	3	2	3	7
Total gains (losses) included in shareholders' net income	3	2	3	7
Gains or losses included in other comprehensive income	(3)	6	5	8
Gains or losses required to adjust future policy benefits for settlement annuities	7	11	(4)	5
Purchases	30	42	67	49
Settlements	(26)	(19)	(29)	(31)
Total purchases, sales, settlements	4	23	38	18
Transfers into/(out of) Level 3:
Transfers into Level 3	46	19	119	19
Transfers out of Level 3	(1)	(39)	(35)	(40)
Total transfers into/(out of) Level 3	45	(20)	84	(21)
Ending balance	1,128	950	1,128	950
Total gains (losses) included in income attributable to instruments held at the reporting date	0	2	0	7
Guaranteed Minimum Income Benefits Assets [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	617	459	712	480
Gains (losses) included in shareholders' net income:
GMIB fain value gain/(loss)	99	48	13	27
Other	0	0	0	0
Total gains (losses) included in shareholders' net income	99	48	13	27
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
Settlements	(9)	(17)	(18)	(17)
Total purchases, sales, settlements	(9)	(17)	(18)	(17)
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	707	490	707	490
Total gains (losses) included in income attributable to instruments held at the reporting date	$ 99	$ 48	$ 13	$ 27