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Revenue - Recognized (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenue recognized $ 3,078 $ 2,757  
Total revenue 3,078 2,757  
Contract with Customer, Asset, after Allowance for Credit Loss 52   $ 37
Over time      
Disaggregation of Revenue [Line Items]      
Revenue recognized 1,628 1,475  
Point in time      
Disaggregation of Revenue [Line Items]      
Revenue recognized $ 1,450 $ 1,282