XML 140 R115.htm IDEA: XBRL DOCUMENT v3.8.0.1
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowances for doubtful accounts, deducted from accounts receivable      
Movement in valuation and qualifying accounts      
Balance at Beginning of Period $ 11 $ 11 $ 14
Additions, Charged to Costs and Expenses 5 4 4
Additions, Charged to Other Accounts 0 0 0
Deductions (3) (4) (7)
Balance at End of Period 13 11 11
Valuation Allowance on deferred tax assets      
Movement in valuation and qualifying accounts      
Balance at Beginning of Period 45 49 66
Additions, Charged to Costs and Expenses 0 11 36
Additions, Charged to Other Accounts 2 0 0
Deductions 0 (15) (53)
Balance at End of Period 47 45 $ 49
Valuation Allowance on deferred tax assets | Other Comprehensive Income (Loss)      
Movement in valuation and qualifying accounts      
Additions, Charged to Other Accounts $ 2    
Deductions   (2)  
Certain net operating loss carryforward      
Movement in valuation and qualifying accounts      
Deductions   $ (13)