Annual report pursuant to Section 13 and 15(d)

Revenue - Transaction Price Allocation and Contract Balances (Details)

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Revenue - Transaction Price Allocation and Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue    
Original expected duration true  
Receivables from contracts with customers $ 318 $ 475