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Debt - Senior Notes (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jan. 31, 2017 | Aug. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of senior notes |  |  |  |  | $ 1,350 | $ 175
Senior notes | 4.50% senior notes due December 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Offering price percentage |  |  |  |  |  | 99.716%
Debt instrument, interest rate (as a percent) |  |  |  | 4.50% |  | 4.50%
Senior notes | 6.13% senior notes due January 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of senior notes |  | $ 400 |  |  |  |
Debt instrument, interest rate (as a percent) |  | 6.13% |  |  |  |
Senior notes | 6.50% senior notes due May 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of senior notes | $ 600 |  |  |  |  |
Debt instrument, interest rate (as a percent) | 6.50% |  |  |  | 6.50% |
Senior notes | 8.75% senior notes due May 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of senior notes | $ 350 |  |  |  |  |
Debt instrument, interest rate (as a percent) | 8.75% |  |  |  | 8.75% |
Senior notes | 5.88% senior notes due August 2016 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of senior notes |  |  | $ 175 |  |  |
Debt instrument, interest rate (as a percent) |  |  | 5.88% |  |  |
Consolidated finance subsidiary co-issuer | Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consolidated subsidiary, ownership interest held by the parent (as a percent) |  |  |  | 100.00% |  |
Other income/(expense), net | Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early redemption of senior notes |  |  |  |  | $ 40 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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