Derivatives and Hedging Instruments - Derivative Fair Values (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 currency	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Currency Exposure, Number of Functional Currencies	50
Maximum Period For Cash Flow Hedging Activity	0 years 15 months
Derivative Assets, Fair Value	$ 4	$ 1
Derivative Liabilities, Fair Value	13	20
Interest Rate Swap Beginning Notional	560
Interest Rate Swap Ending Notional	341
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	2	0
Derivative Liabilities, Fair Value	10	17
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	2	1
Derivative Liabilities, Fair Value	3	3
Foreign Exchange Derivative [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2
Foreign Exchange Derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	77	28
Derivative Assets, Fair Value	2	0
Foreign Exchange Derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	35	72
Derivative Liabilities, Fair Value	0	1
Foreign Exchange Derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	234	169
Derivative Assets, Fair Value	2	1
Foreign Exchange Derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	292	245
Derivative Liabilities, Fair Value	3	3
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	6
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0	0
Derivative Assets, Fair Value	0	0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	4	5
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities And Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	546	560
Derivative Liabilities, Fair Value	10	16
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ 6	$ 11