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Revenue from Contracts with Customers - Estimate at Completion Adjustments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Accounting Estimate [Line Items]      
Revenue $ 2,879 $ 2,778 $ 2,714
Contracts Accounted for under Percentage of Completion      
Change in Accounting Estimate [Line Items]      
Revenue $ (34) $ (77) $ (55)
Total % of Revenue 1.00% 3.00% 2.00%