XML 145 R131.htm IDEA: XBRL DOCUMENT v3.6.0.2
Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trade accounts receivable [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 83 $ 88 $ 78
Charged to costs and expense 9 4 0
Charged to other accounts (1) (9) 10
Deductions – write-offs (15) 0 0
Balance at end of period 76 83 88
Deferred tax assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 241 245 343
Charged to costs and expense (14) 21 (70)
Charged to other accounts 2 (9) (11)
Deductions – write-offs (4) (16) (17)
Balance at end of period $ 225 $ 241 $ 245