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Revenue - Recognized (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Total revenue $ 2,920 $ 2,489 $ 8,340 $ 6,932  
Contract with Customer, Asset, after Allowance for Credit Loss 34   34   $ 20
Over time          
Disaggregation of Revenue [Line Items]          
Revenue recognized 1,527 1,239 4,448 3,696  
Point in time          
Disaggregation of Revenue [Line Items]          
Revenue recognized $ 1,393 $ 1,250 $ 3,892 $ 3,236