Accounts Receivable - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Receivables [Abstract]
Deferred proceeds receivables from sales of accounts receivables	$ 121		$ 116
Accounts receivable sold, uncolleced at balance sheet date	723		766
Accounts receivable sales	3,401		3,699		3,218
Deferred proceeds	486		639		386
Loss on sale of accounts receivables	17		21		20
Estimated (decrease) increase to operating cash flows	$ (55)	[1]	$ (78)	[1]	$ 133	[1]

[1] Represents the difference between current and prior year fourth quarter receivable sales adjusted for the effects of: (i) the deferred proceeds, (ii) collections prior to the end of the year and (iii) currency.