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Accounts Receivable, Net - Accounts Receivable Sales Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accounts Receivable Sales Arrangements [Abstract]          
Uncollected accounts receivable sold and derecognized $ 83   $ 83   $ 165
Accounts Receivable          
Accounts Receivable Sales Arrangements [Abstract]          
Accounts receivable sales $ 115 $ 67 $ 182 $ 265