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Revenue Recognition - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
USD ($)
Jun. 30, 2018
USD ($)
country
Jun. 30, 2018
USD ($)
country
Rate
Disaggregation of Revenue [Line Items]      
Number of countries in which entity operates | country   85 85
Percentage of Service Revenue Recognize over Time | Rate     10.00%
Contract liabilities $ 381 $ 337 $ 337
Contract liabilities, recognized in sales   $ 33 $ 158
Accounting Standards Update 2014-09      
Disaggregation of Revenue [Line Items]      
Cumulative effect on retained earnings, net of tax $ 64