Derivative Financial Instruments (Details 6) (Cash Flow Hedges, USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash Flow Hedges
Other Comprehensive Income Loss Before Income Tax Related To Cash Flow Hedges
Other comprehensive income (loss), balance at beginning of period	$ (237)	$ 44	$ (59)	$ (76)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges	82	566	(103)	617
Amounts reclassified to net derivatives gains (losses)	(12)	(17)	(8)	51
Amounts reclassified to net investment income	0	1	1	2
Amounts reclassified to other expenses	2	(1)	4	(1)
Other comprehensive income (loss), balance at end of period	$ (165)	$ 593	$ (165)	$ 593