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Taxes on Income - Temporary Differences (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Legal and regulatory settlements $ 27 $ 23
Employee compensation 50 78
Accrued expenses 47 87
Postretirement benefits 34 105
Unearned revenue 26 33
Allowance for doubtful accounts 8 11
Loss carryforwards 135 112
Other 45 3
Total deferred tax assets 372 452
Deferred tax liabilities:    
Goodwill and intangible assets (249) (320)
Fixed assets (4) (3)
Other 0 0
Total deferred tax liabilities (253) (323)
Net deferred income tax asset before valuation allowance 119 129
Valuation allowance (127) (116)
Net deferred income tax (liability) asset (8)  
Net deferred income tax (liability) asset   13
Reported as:    
Non-current deferred tax assets 59  
Non-current deferred tax assets   61
Non-current deferred tax liabilities (67)  
Non-current deferred tax liabilities   (48)
Net deferred income tax (liability) asset $ (8)  
Net deferred income tax (liability) asset   $ 13