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Revenue - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 426	$ 1,200
Deferred revenue expected to be recognized in the remainder of 2018	560	560
Deferred revenue expected to be recognized in 2019	1,000	1,000
Deferred revenue expected to be recognized in 2020	497	497
Deferred revenue expected to be recognized thereafter	$ 600	$ 600

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- Definition

Deferred Revenue, Due Thereafter

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- Definition

Deferred Revenue, Due in Remainder of Fiscal Year

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- Definition

Deferred Revenue, Due in Year Three

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- Definition

Deferred Revenue, Due in Year Two

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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