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Debt - Senior Notes (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Repayments of senior notes | $ 1,000,000,000 | $ 1,350,000,000 |
Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument face value | $ 9,000,000,000.0 |  | $ 9,000,000,000.0
Senior notes | 3.55% senior notes due December 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) | 3.55% |  |
Offering price percentage | 99.801% |  |
Debt instrument face value | $ 1,000,000,000 |  |
Senior notes | 2.60% senior notes due December 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) | 2.60% |  | 2.60%
Debt instrument face value |  |  | $ 500,000,000
Repayments of senior notes | $ 500,000,000 |  |
Senior notes | 5.75% senior notes due January 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) | 5.75% |  | 5.75%
Repayments of senior notes | $ 500,000,000 |  |
Senior notes | 6.13% senior notes due January 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  | 6.13% |
Repayments of senior notes |  | $ 400,000,000 |
Senior notes | 6.50% senior notes due May 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  | 6.50% |
Repayments of senior notes |  | $ 600,000,000 |
Senior notes | 8.75% senior notes due May 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  | 8.75% |
Repayments of senior notes |  | $ 350,000,000 |
Consolidated finance subsidiary co-issuer |  |  |
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 |  | $ 40,000,000 |

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