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Revenue Related to Contracts With Customers (Tables)
 12 Months Ended
Dec. 31, 2018
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 Revenue
2018
2017
2016
U.S.
$
6,576

$
4,409

$
3,156

Non-U.S.
16,301

12,770

9,926

Total
$
22,877

$
17,179

$
13,082