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Revenue Related to Contracts With Customers (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregated revenue from contracts with customers by primary geographical markets We disaggregate our revenue from contracts with customers by primary geographic markets.
Total Revenue202020192018
U.S.$4,638 $6,188 $6,576 
Non-U.S.16,067 17,650 16,301 
Total$20,705 $23,838 $22,877