Accumulated Other Comprehensive Loss (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Change in accumulated other comprehensive income (loss) balances
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance			$ (17)	$ (21)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Change during the period	15	(4)	20
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance	3	(21)	3	(21)
Net Unrealized Gains (Losses) on Securities, Beginning Balance			(107)	(238)
Net Unrealized Gains (Losses) on Securities, Change during the period	47	69	86	42
Net Unrealized Gains (Losses) on Securities, Ending Balance	(21)	(196)	(21)	(196)
Foreign Currency Translation Adjustment, Beginning Balance				1
Foreign Currency Translation Adjustment, Change during the period	(1)	(1)		1
Foreign Currency Translation Adjustment, Ending Balance		2		2
Pension and Other Benefits Adjustment, Beginning Balance			(685)	(419)
Pension and Other Benefits Adjustment, Change during the period	14	8	30	21
Pension and Other Benefits Adjustment, Ending Balance	(655)	(398)	(655)	(398)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(809)	(677)
Accumulated Other Comprehensive Income Loss, Change during the period	75	72	136	64
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (673)	$ (613)	$ (673)	$ (613)