Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation and Qualifying Accounts Beginning Balance	$ 278		$ 303		$ 324
Additions charged to bad debt provision	120	[1]	119	[1]	157	[1]
Amounts (credited) charged to other income statement accounts	3	[1]	8	[1]	(3)	[1]
Deductions and other, net of recoveries	(135)	[2]	(152)	[2]	(175)	[2]
Valuation and Qualifying Accounts Ending Balance	266		278		303
Accounts Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation and Qualifying Accounts Beginning Balance	108		102		112
Additions charged to bad debt provision	39	[1]	44	[1]	57	[1]
Amounts (credited) charged to other income statement accounts	(2)	[1]	3	[1]	(1)	[1]
Deductions and other, net of recoveries	(33)	[2]	(41)	[2]	(66)	[2]
Valuation and Qualifying Accounts Ending Balance	112		108		102
Financing Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation and Qualifying Accounts Beginning Balance	170		201		212
Additions charged to bad debt provision	81	[1]	75	[1]	100	[1]
Amounts (credited) charged to other income statement accounts	5	[1]	5	[1]	(2)	[1]
Deductions and other, net of recoveries	(102)	[2]	(111)	[2]	(109)	[2]
Valuation and Qualifying Accounts Ending Balance	$ 154		$ 170		$ 201

[1] Bad debt provisions relate to estimated losses due to credit and similar collectability issues. Other charges (credits) relate to adjustments to reserves necessary to reflect events of non-payment such as customer accommodations and contract terminations.

[2] Deductions and other, net of recoveries primarily relates to receivable write-offs, but also includes the impact of foreign currency translation adjustments and recoveries of previously written off receivables.