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Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of accounting changes					$ 193,000,000
Bad debts expense		$ 71,000,000	$ 68,000,000
Capitalized contract cost
Amortization of contract cost assets	$ 31,000,000	93,000,000
Impairment of capitalized contract cost	0	0
Retained earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of accounting changes					$ 163,000,000
Revenue from contract with customer
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Bad debts expense	$ 27,000,000	$ 70,000,000
ASU 2014-09 | Retained earnings
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of accounting changes				$ 163,000,000

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

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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-Name Accounting Standards Codification
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-SubTopic 10
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