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

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Amount of accumulated impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Indicates (true/false) whether practical expedient is elected under initial application of retrospective method not to restate completed contracts that begin and end in same annual reporting period.

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Revenue Recognition, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
Revenue, Practical Expedient [Abstract]
Revenue recognition completed contract, practical expedient	false
Revenue recognition [Line Items]
Cumulative effect of accounting changes	$ 195
Bad debts expense	20	$ 24
Capitalized contract cost
Impairment of capitalized contract cost	0
Amortization of contract cost assets	31
Retained earnings
Revenue recognition [Line Items]
Cumulative effect of accounting changes	165
Revenue from contract with customer
Revenue recognition [Line Items]
Bad debts expense	$ 20
Revenue recognition \| Retained earnings
Revenue recognition [Line Items]
Cumulative effect of accounting changes			$ 164