Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Contract assets	$ 311	$ 368
Contract liabilities	2,233	2,106
Contract liabilities, current	1,854	1,758
Contract liabilities in other long-term liabilities	379	$ 348
Revenue recognized	300
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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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