Goodwill and Other Identifiable Intangible Assets (Identifiable Intangible Assets with Finite Lives) (Detail) - USD ($) $ in Millions	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Carrying amount of acquired trademarks with indefinite lives	$ 1,158				$ 1,107						$ 1,158	$ 1,107
Gross carrying amount	2,260				2,039						2,260	2,039
Accumulated amortization	(1,373)				(1,163)						(1,373)	(1,163)
Net	887				876						887	876
Intangible assets, gross (excluding goodwill)	3,418				3,146						3,418	3,146
Intangible assets, accumulated amortization (excluding goodwill)					1,163							1,163
Total Identifiable Intangible Assets	2,045	$ 2,099	$ 2,118	$ 2,080	1,983				$ 2,118	$ 2,099	2,045	1,983
Aggregate amortization expense of identifiable intangible assets	34	$ 32	$ 32	$ 31	30	$ 31	$ 30	$ 30	$ 63	$ 95	129	121	$ 132
Estimated future amortization of identifiable intangible assets in 2018	125										125
Estimated future amortization of identifiable intangible assets in 2019	115										115
Estimated future amortization of identifiable intangible assets in 2020	105										105
Estimated future amortization of identifiable intangible assets in 2021	100										100
Estimated future amortization of identifiable intangible assets in 2022	100										100
Acquired technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	613				587						613	587
Accumulated amortization	(489)				(446)						(489)	(446)
Net	124				141						124	141
Customer-related
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,437				1,272						1,437	1,272
Accumulated amortization	(762)				(618)						(762)	(618)
Net	675				654						675	654
Tradenames
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	166				142						166	142
Accumulated amortization	(87)				(71)						(87)	(71)
Net	79				71						79	71
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	44				38						44	38
Accumulated amortization	(35)				(28)						(35)	(28)
Net	$ 9				$ 10						$ 9	$ 10