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Debt (Schedule of Balances Available for Borrowings)(Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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Revolving Credit Facility [Member]
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| Debt Instrument [Line Items] | ||||||
| Borrowings outstanding | $ 0 | |||||
| Letters of credit issued | 0 | |||||
| Available for borrowing | 900 | |||||
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Accounts Receivable Securitization Facility [Member]
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| Debt Instrument [Line Items] | ||||||
| Borrowings outstanding | 35 | [1] | 50 | [1] | ||
| Letters of credit issued | 79 | |||||
| Available for borrowing | $ 21 | |||||
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