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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Number of reportable segments | segment | 1 |
Bank overdrafts | $ 0 | $ 57
Cash | 279 |
Unamortized issuance costs, senior notes | $ 0 | 44
Revenue, payment terms | 30 days |
Exit credit facility | Credit facility |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Unamortized issuance costs | $ 33 |
Employee |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Vesting period | 3 years |
Director |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Vesting period | 3 years |
Other noncurrent assets |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Unamortized issuance costs |  | $ 27

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