Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets
Employee pensions and other benefits	$ 276	$ 207
Other balance sheet reserves and allowances	164	170
Tax loss and credit carryforwards	628	739
Capitalized research and development	97	107
Property, plant and equipment	12	8
Other	37	32
Total deferred income tax assets	1,214	1,263
Valuation allowance	(346)	(294)
Net deferred income tax assets	868	969
Deferred income tax liabilities
Intangible Assets	270	302
Deferred Tax Liabilities, Taxable Distribution	0	55
Capitalized software	36	32
Other	6	4
Total deferred income tax liabilities	312	393
Total net deferred income tax assets	556	$ 576
U.S. federal and foreign tax attribute carryforwards	1,300
United States [Member]
Deferred income tax assets
Net deferred income tax assets	456
Deferred income tax liabilities
Tax credit carryforward, amount	295
Tax credit carryforward, not subject to expiration	21
Tax credit carryforward, expires in years 2014 through 2032	274
U.S. Federal [Member]
Deferred income tax liabilities
Tax deductions in excess of previously recorded stock-based compensation windfall tax benefits but not reflected in deferred tax assets	$ 38