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Short And Long-Term Debt Maturities Table (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2015
Maturities of Long-term Debt |  |  |  |
Remaining 2016 | $ 21 |  |  |
2017 | 41 |  |  |
2018 | 52 |  |  |
2019 | 513 |  |  |
2020 | $ 2,105 |  |  |
Long-term Debt Maturities, Years Presented | 4 years |  |  |
Current portion of long-term debt | $ 41 |  |  | $ 740
Scenario, Forecast | Secured Debt | Term Loan A |  |  |  |
Maturities of Long-term Debt |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 11 | $ 22 |
Scenario, Forecast | Secured Debt | Term Loan B |  |  |  |
Maturities of Long-term Debt |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 10 | $ 19 |

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