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Debt, Components of Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Total borrowings under long-term debt |  | $ 2,936 |  | $ 2,940
Less: Long-term debt due within one year |  | (16) |  | (16)
Debt issuance costs |  | (33) |  | (36)
Long-term debt |  | $ 2,887 |  | 2,888
Average effective interest rate |  | 5.00% | 4.90% |
Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Original principal | [1] | $ 1,500 |  |
Annual interest rate | [1] | Variable |  |
Maturity date | [1] | Mar. 19, 2020 |  |
Total borrowings under long-term debt | [1] | $ 1,437 |  | 1,441
Senior Notes due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Original principal |  | $ 900 |  |
Annual interest rate |  | 6.375% |  |
Maturity date |  | Aug. 15, 2020 |  |
Total borrowings under long-term debt |  | $ 896 |  | 896
Senior Notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Original principal |  | $ 600 |  |
Annual interest rate |  | 7.50% |  |
Maturity date |  | Mar. 15, 2022 |  |
Total borrowings under long-term debt |  | $ 584 |  | 584
Lease Financing [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total borrowings under long-term debt |  | $ 19 |  | $ 19
[1] | Average effective interest rate of 5.0% and 4.9% during the three months ended March 31, 2017 and 2016, respectively.

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