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Business Segments - Equity In Net Income (Loss) of Investees Accounted For By Equity Method (Details) - Operating Segments - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Equity in (Income) Loss | $ 31 | $ 32 | $ 10
Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity in (Income) Loss | 31 | 32 | 11
Europe, Middle East and Africa |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity in (Income) Loss | $ 0 | $ 0 | $ (1)

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