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Summary of Significant Accounting Policies - Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt | $ 10,308 | $ 9,011
Level 1 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt | 0 | 0
Level 2 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt | 10,308 | 9,011
Level 3 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt | $ 0 | $ 0

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