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Commitments and Contingencies (Leases) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Rental expenses for all leases, including leases with terms of less than one year | $ 45,000,000 | $ 72,000,000 | $ 95,000,000
Depreciation expense for assets held under capital lease | 23,000,000 | 23,000,000 | $ 21,000,000
Aggregate carrying amount of assets held under capital lease |  |  |
Property and equipment, cost | 776,000,000 | 774,000,000 |
Accumulated depreciation | (149,000,000) | (125,000,000) |
Property and equipment, net | 627,000,000 | $ 649,000,000 |
Capital lease, future minimum rental payments |  |  |
2017 | 66,000,000 |  |
2018 | 72,000,000 |  |
2019 | 72,000,000 |  |
2020 | 72,000,000 |  |
2021 | 71,000,000 |  |
Thereafter | 550,000,000 |  |
Total future minimum rental payment | 903,000,000 |  |
Less amount representing imputed interest | (337,000,000) |  |
Present value of future minimum rental payments under capital leases | 566,000,000 |  |
Less current portion included in debt due within one year | (25,000,000) |  |
Long-term capital lease obligation | 541,000,000 |  |
Operating leases, future minimum rental payments |  |  |
2017 | 10,000,000 |  |
2018 | 11,000,000 |  |
2019 | 10,000,000 |  |
2020 | 9,000,000 |  |
2021 | 9,000,000 |  |
Thereafter | 42,000,000 |  |
Total future minimum rental payment | $ 91,000,000 |  |
Capital lease contract due August 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Implicit interest rate (as a percent) | 7.80% |  |
Scheduled monthly payments under capital lease obligation | $ 6,000,000 |  |
End of lease obligation | $ 1 |  |

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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