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Revenue Related to Contracts with Customers - Disaggregated Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues $ 5,049 $ 5,882 $ 15,210 $ 17,490
U.S.        
Disaggregation of Revenue [Line Items]        
Revenues 1,032 1,500 3,330 4,621
Non-U.S.        
Disaggregation of Revenue [Line Items]        
Revenues $ 4,017 $ 4,382 $ 11,880 $ 12,869