Condensed Consolidated Statement of Comprehensive Loss Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unrealized loss on derivatives, income tax benefit (in dollars)	$ 24	$ 45	$ 76	$ 131
Foreign currency translation, income tax expense (in dollars)	0	16	1	4
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment Realized upon Sale or Liquidation, Tax	6	0	6	0
Available-for-sale Securities, Income tax benefit	$ (1)	$ 1	$ (1)	$ 1