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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trade accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 71 $ 76 $ 83
Charged to costs and expense (6) 0 9
Charged to other accounts (4) 6 (1)
Acquisitions 7 0 0
Deductions – write-offs (3) (11) (15)
Balance at end of period 65 71 76
Deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 228 225 241
Charged to costs and expense (1) 9 (14)
Charged to other accounts (7) 0 2
Acquisitions 76 0 0
Deductions – write-offs (14) (6) (4)
Balance at end of period $ 282 $ 228 $ 225