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Revenue From Contracts With Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Allowance for doubtful accounts | $ 19 |  | $ 17
Market Services | Services transferred at a point in time |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue recognized (percentage) | 70.50% | 73.20% |
Market Services | Services transferred over time |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue recognized (percentage) | 29.50% | 26.80% |

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