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Revenue Recognition - Revenue not Under ASC 606 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Total revenue [1] $ 5,228 $ 5,427
Adjustments for non-ASC 606 revenue (481) (358)
Total revenue from contracts with customers $ 4,747 $ 5,069
[1] Reclassifications were made within certain 2019 comparative figures due to the retrospective application of an accounting policy election during the first quarter of 2020. Refer to Note 1 - Background and our Form 8-K filing dated April 30, 2020 for further information.