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Commitments and Contingencies (Future Minimum Capital Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2014
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| Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] | ||||
| 2015 | $ 42 | |||
| 2016 | 32 | |||
| 2017 | 20 | |||
| 2018 | 11 | |||
| 2019 | 4 | |||
| Thereafter | 8 | |||
| Total | 117 | |||
| Less amount representing interest | (12) | [1] | ||
| Capital lease obligations | $ 105 | |||
| Capital leases | ||||
| Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] | ||||
| Weighted average interest rate | 5.30% | |||
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