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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract Acquisition Costs
Revenue other than customer contracts (as a percent)	1.00%	1.00%
Deferred contract costs	$ 145
Long-term revenue contracts (as a percent)	25.00%
Weighted average remaining contract term	4 years
Deferred Sales Incentives [Member]
Contract Acquisition Costs
Deferred contract costs	$ 109
Selling, General and Administrative Expenses [Member]
Contract Acquisition Costs
Deferred contract costs amortization	22
Reduction to Sales [Member]
Contract Acquisition Costs
Deferred contract costs amortization	$ 35
Minimum [Member]
Contract Acquisition Costs
Deferred revenue recognition period	1 month
Contract amortization period	5 years
Maximum [Member]
Contract Acquisition Costs
Deferred revenue recognition period	3 months
Contract amortization period	13 years

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
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-Section 50
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