Revenue Recognition - Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of geographic segments \| segment	3
Contract assets	$ 405	$ 283
Contract liabilities	1,880	1,934
Contract liabilities, current	1,682	1,546
Deferred Income, Current		234
Contract liabilities in other long-term liabilities	198	$ 154
Revenue recognized	780
Estimated consideration related to unsatisfied performance obligations	$ 46,000
Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	83.00%
Americas, APAC, and EMEA Segments
Disaggregation of Revenue [Line Items]
Number of geographic segments \| segment	3
Engineering \| Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	17.00%
Minimum
Disaggregation of Revenue [Line Items]
On-site product supply contract	10 years
Maximum
Disaggregation of Revenue [Line Items]
On-site product supply contract	20 years

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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