Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Change in fair value of available-for-sale securities, income tax	$ 0	$ 0	$ 0
Available-for-sale securities, reclassification to earnings, income tax	0	0	0
Foreign currency translation adjustments, income tax	10	0	18
Foreign currency, reclassification to earnings, income tax	0	0	0
Change in derivative fair value, income tax	(31)	35	108
Derivative reclassification to earnings, income tax	(41)	(56)	(22)
Pension, prior service cost for the period, income tax	0	0	0
Pension, net actuarial gain (loss) for the period, income tax	(198)	300	117
Pension, amortization of net actuarial loss, income tax	$ (26)	$ (15)	$ (6)