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New Accounting Standards and Reclassifications - Revenue (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 9,797		$ 8,588
Contract acquisition costs	145
Deferred income taxes	$ 1,291		$ 1,248
Revenue, Practical Expedient, Remaining Performance Obligation [true/false]	true
Accounting Standards Update 2014-09 [Member] | Impact of adoption [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 80
Contract acquisition costs		108
Deferred income taxes		$ 28

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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.

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