Income Taxes - Components of Current and Noncurrent Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current:
Gross deferred tax assets	$ 1,819	$ 1,607
Gross deferred tax liabilities	(984)	(992)
Valuation allowance	(211)	(183)
Total deferred tax assets	1,608	1,424
Total deferred tax liabilities	(984)	(992)
Current assets
Current:
Accounts and notes receivable	96	68
Inventory	73	64
Accrued expenses	311	281
Deferred revenue	365	281
Equity	83	98
Net operating losses	28	29
Total current	960	826
Deferred Tax Assets, Tax Credit Carryforwards	4	5
Noncurrent assets
Current:
Deferred revenue	253	177
Net operating losses	78	98
Deferred Tax Liabilities, Equity Adjustments	(139)	(144)
Deferred Tax Assets, Tax Credit Carryforwards	280	242
Other comprehensive loss	109	120
Deferred Tax Assets, Gross, Noncurrent	859	781
Noncurrent liabilities
Current:
Property, plant and equipment, net	(291)	(286)
Intangible and other assets, net	(680)	(663)
Other non-current liabilities	(13)	(43)
Deferred Tax Liability, Total noncurrent	$ (984)	$ (992)