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Revenue Related to Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2021
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.
Three Months Ended June 30,Six Months Ended June 30,
Total Revenue2021202020212020
U.S.$1,085 $983 $2,138 $2,298 
Non-U.S.4,057 3,753 7,786 7,862 
Total$5,142 $4,736 $9,924 $10,160