Derivative Instruments and Hedging Strategies (Forward Currency Exchange Contracts) (Details) (Foreign Exchange Contract [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Prepaid Expenses and Other Current Assets [Member]
Derivative asset	$ 21	$ 3
Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivative asset	11	0
Prepaid Expenses and Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative asset	10	3
Noncurrent Assets- Other [Member]
Derivative asset	4	0
Noncurrent Assets- Other [Member] | Designated as Hedging Instrument [Member]
Derivative asset	1	0
Noncurrent Assets- Other [Member] | Not Designated as Hedging Instrument [Member]
Derivative asset	3	0
Accrued Expenses and Other Current Liabilities [Member]
Derivative liability	2	1
Accrued Expenses and Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative liability	1	0
Accrued Expenses and Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative liability	1	1
Other Noncurrent Liabilities [Member]
Derivative liability	0	0
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative liability	0	0
Other Noncurrent Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative liability	$ 0	$ 0