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Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Contract Acquisition Costs
Revenue other than customer contracts (as a percent)		1.00%	1.00%
Deferred contract costs	$ 139	$ 139
Long-term revenue contracts (as a percent)		30.00%
Weighted average remaining contract term		4 years
Deferred Sales Incentives [Member]
Contract Acquisition Costs
Deferred contract costs	108	$ 108
Selling, General and Administrative Expenses [Member]
Contract Acquisition Costs
Deferred contract costs amortization	5	11
Reduction to Sales [Member]
Contract Acquisition Costs
Deferred contract costs amortization	$ 9	$ 19
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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Amount, after accumulated amortization and accumulated impairment loss, of 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
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+ References

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Deferred revenue recognition period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The percent of revenue derived from long-term contracts.

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Revenue from sources other than customer contracts as a percent.

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- Definition

Weighted Average Remaining Contract Term

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