Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Accrued expenses and allowances	$ 544	$ 820
U.S. federal and state net operating loss carryforwards	216	147
Share-based compensation	97	126
Nondeductible liabilities	169	236
Non-U.S. tax loss carryforwards	445	434
Other-domestic	167	476
Other-non-U.S.	198	175
Subtotal	1,836	2,414
Less: valuation allowances	(64)	(55)
Total deferred income tax assets	1,772	2,359
Deferred income tax liabilities:
U.S. federal and state intangible assets	(1,998)	(3,055)
Non-U.S. goodwill and intangible assets	(602)	(584)
Capitalized software	(530)	(707)
Depreciation and amortization	(236)	(332)
Prepaid expenses	(223)	(228)
Outside basis in partnerships	(279)	(132)
Other-non-U.S.	(86)	(82)
Total deferred income tax liabilities	(3,954)	(5,120)
Net deferred income tax liabilities	$ (2,182)	$ (2,761)