Fair Value Measurements (Details - Level 3 roll forwards) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Gains (losses) included in shareholders' net income:
GMIB fair value loss	$ (67)	$ (16)
Changes In Level 3 Separate Account Assets [Abstract]
Beginning Balance	750	594
Policyholder gains (losses)	18	58
Purchases	184	9
Sales	0	(40)
Settlements	(11)	(59)
Purchases, sales, settlements	173	(90)
Transfers into/(out of) Level 3:
Transfers into Level 3	3	0
Transfers out of Level 3	(1)	(3)
Total transfers into/(out of) Level 3	2	(3)
Ending Balance	943	559
Guaranteed Minimum Income Benefits Liabilities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(1,333)	(903)
Gains (losses) included in shareholders' net income:
GMIB fair value loss	153	37
Other	0	0
Total gains (losses) included in shareholders' net income	153	37
Gains or losses included in other comprehensive income	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0
Purchases	0	0
Settlements	18	16
Total purchases, sales, settlements	18	16
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
Ending balance	(1,162)	(850)
Total gains (losses) included in income attributable to instruments held at the reporting date	153	37
Guaranteed Minimum Income Benefits Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	(621)	(423)
Gains (losses) included in shareholders' net income:
GMIB fair value loss	67	16
Other	0	0
Total gains (losses) included in shareholders' net income	67	16
Gains or losses included in other comprehensive income	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0
Purchases	0	0
Settlements	9	16
Total purchases, sales, settlements	9	16
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
Ending balance	(545)	(391)
Total gains (losses) included in income attributable to instruments held at the reporting date	67	16
Fixed Maturities And Equity Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	1,002	933
Gains (losses) included in shareholders' net income:
GMIB fair value loss	0	0
Other	0	5
Total gains (losses) included in shareholders' net income	0	5
Gains or losses included in other comprehensive income	8	2
Gains or losses required to adjust future policy benefits for settlement annuities	(11)	(6)
Purchases	37	7
Settlements	(3)	(12)
Total purchases, sales, settlements	34	(5)
Transfers into/(out of) Level 3:
Transfers into Level 3	73	0
Transfers out of Level 3	(34)	(1)
Total transfers into/(out of) Level 3	39	(1)
Ending balance	1,072	928
Total gains (losses) included in income attributable to instruments held at the reporting date	0	5
Guaranteed Minimum Income Benefits Assets [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	712	480
Gains (losses) included in shareholders' net income:
GMIB fair value loss	(86)	(21)
Other	0	0
Total gains (losses) included in shareholders' net income	(86)	(21)
Gains or losses included in other comprehensive income	0	0
Gains or losses required to adjust future policy benefits for settlement annuities	0	0
Purchases	0	0
Settlements	(9)	0
Total purchases, sales, settlements	(9)	0
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
Ending balance	617	459
Total gains (losses) included in income attributable to instruments held at the reporting date	$ (86)	$ (21)