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Income Taxes Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax assets    
Employee pensions and other liabilities $ 62 $ 61
Other balance sheet reserves and allowances 23 22
Tax loss and credit carryforwards 62 59
Deferred revenue 3 0
Total deferred income tax assets 150 142
Valuation allowance (25) (20)
Net deferred income tax assets 125 122
Deferred income tax liabilities    
Intangibles and capitalized software 81 102
Property and equipment 30 29
Deferred revenue 0 17
Other 1 12
Total deferred income tax liabilities 112 160
Total net deferred income tax assets (liabilities) $ 13  
Total deferred income tax liabilities   $ (38)