Goodwill and Other Identifiable Intangible Assets (Identifiable Intangible Assets with Finite Lives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Trademarks	$ 1,142		$ 1,142		$ 1,158
Gross Carrying Amount	2,253		2,253		3,418
Accumulated Amortization	(1,409)		(1,409)		(1,373)
Net	1,986		1,986		2,045
Amortization of intangible assets	34	$ 32	70	$ 63
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	60		60
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	120		120
Finite-Lived Intangible Assets, Amortization Expense, Year Two	110		110
Finite-Lived Intangible Assets, Amortization Expense, Year Three	105		105
Finite-Lived Intangible Assets, Amortization Expense, Year Four	105		105
Finite-Lived Intangible Assets, Amortization Expense, Year Five	95		95
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	249		249
Acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	630		630		613
Accumulated Amortization	(502)		(502)		(489)
Net	128		128		124
Customer-related intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,414		1,414		1,437
Accumulated Amortization	(781)		(781)		(762)
Net	633		633		675
Tradenames [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	166		166		166
Accumulated Amortization	(91)		(91)		(87)
Net	75		75		79
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43		43		44
Accumulated Amortization	(35)		(35)		(35)
Net	$ 8		$ 8		$ 9