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Related Parties (Details) - TTX Company [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 36.79% |  | 36.79% |  |
Equity Method Investments | $ 1,500 |  | $ 1,500 |  | $ 1,400
Related Party Transaction, Expenses from Transactions with Related Party | 98 | $ 100 | 282 | $ 312 |
Accounts Payable, Related Parties, Current | $ 67 |  | $ 67 |  | $ 62

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