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Related Parties (Details) - TTX Company [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 36.79% |  | 36.79% |  |
Equity Method Investments | $ 1,600 |  | $ 1,600 |  | $ 1,500
Related Party Transaction, Expenses from Transactions with Related Party | 92 | $ 98 | 283 | $ 282 |
Accounts Payable, Related Parties, Current | $ 57 |  | $ 57 |  | $ 59

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