Summary of Significant Accounting Policies - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions |
Mar. 31, 2020 |
Dec. 31, 2019 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Debt | $ 8,013 | $ 8,378 |
| Fair Value, Inputs, Level 1 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Debt | 0 | 0 |
| Fair Value, Inputs, Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Debt | 8,013 | 8,378 |
| Fair Value, Inputs, Level 3 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Debt | $ 0 | $ 0 |
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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