Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Change in fair value of available-for-sale securities, income tax	$ 0	$ 0	$ 0	$ 0
Available-for-sale securities, reclassification to earnings, income tax	0	0	0	0
Foreign currency translation adjustments, income tax	1	(2)	3	(1)
Foreign currency, reclassification to earnings, income tax	0	0	0	0
Change in derivative fair value, income tax	0	7	(28)	27
Derivative reclassification to earnings, income tax	(8)	(5)	(30)	(38)
Pension, amortization of net actuarial loss, income tax	$ (6)	$ (4)	$ (20)	$ (10)