XML 132 R123.htm IDEA: XBRL DOCUMENT v3.10.0.1
Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trade accounts receivable [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 76 $ 83 $ 88
Charged to costs and expense 0 9 4
Charged to other accounts 6 (1) (9)
Deductions – write-offs (11) (15) 0
Balance at end of period 71 76 83
Deferred tax assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 225 241 245
Charged to costs and expense 9 (14) 21
Charged to other accounts 0 2 (9)
Deductions – write-offs (6) (4) (16)
Balance at end of period $ 228 $ 225 $ 241