Income Taxes (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes
Undistributed earnings of foreign subsidiaries	$ 2,593,000,000
Unrecognized tax benefits that affect our effective tax rate if recognized	294,000,000
Reconciliation of unrecognized tax benefits
Unrecognized tax benefits balance at January 1	207,000,000	154,000,000	132,000,000
Gross increase for tax positions of prior years	1,000,000	3,000,000	4,000,000
Gross increase for tax positions of current year	91,000,000	59,000,000	65,000,000
Settlements	0	(8,000,000)	0
Lapse of statute of limitations	(5,000,000)	(1,000,000)	(47,000,000)
Unrecognized tax benefits balance at December 31	294,000,000	207,000,000	154,000,000
Income tax liabilities, non-current	271,000,000	197,000,000
Accrued interest and penalties related to uncertain tax positions	13,000,000	11,000,000
Interest expense related to uncertain tax positions	2,000,000	0	1,000,000
Reduction in previously unrecognized tax benefits within next twelve months	$ 23,000,000