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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value assets, Level 1 to Level 2 transfers amount | $ 0 | $ 0
Fair value assets, Level 2 to Level 1 transfers amount | 0 | 0
Fair Value Assets Level 1 To Level 3 Transfers Amount | 0 | 0
Fair Value Assets Level 3 To Level 1 Transfers Amount | 0 | 0
Fair Value Assets Level 2 To Level 3 Transfers Amount | 0 | 0
Fair Value Assets Level 3 To Level 2 Transfers Amount | 0 | $ 0
Goodwill |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Recognized impairment losses | 34 |
Property, Plant and Equipment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Recognized impairment losses | 18 |
Other Intangible Assets |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Recognized impairment losses | $ 3 |

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