Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets
Employee pensions and other benefits	$ 301	$ 276
Other balance sheet reserves and allowances	237	164
Tax loss and credit carryforwards	602	628
Capitalized research and development	99	97
Property, plant and equipment	8	12
Other	38	37
Total deferred income tax assets	1,285	1,214
Valuation allowance	(445)	(346)
Net deferred income tax assets	840	868
Deferred income tax liabilities
Intangible Assets	239	270
Capitalized software	43	36
Other	7	6
Total deferred income tax liabilities	289	312
Total net deferred income tax assets	551	$ 556
U.S. federal and foreign tax attribute carryforwards	1,300
United States [Member]
Deferred income tax assets
Net deferred income tax assets	451
Deferred income tax liabilities
Tax credit carryforward, amount	218
Tax credit carryforward, not subject to expiration	21
Tax credit carryforward, expires in years 2014 through 2032	197
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	$ 39