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Revenue (Accounts Receivable, Contract Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Revenue from External Customer [Line Items] |  |
Accounts receivable, net | $ 1,411 | $ 899
Unbilled |  |
Revenue from External Customer [Line Items] |  |
Accounts receivable, net | 698 | 476
Trade & other |  |
Revenue from External Customer [Line Items] |  |
Accounts receivable, net | $ 713 | $ 423

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