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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 62 $ 65 $ 71
Charged to costs and expense 6 4 (6)
Charged to other  accounts 0 0 (4)
Acquisitions 0 1 7
Deductions – write-offs (9) (8) (3)
Balance at end of period 59 62 65
Deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 243 282 228
Charged to costs and expense (11) (33) (1)
Charged to other  accounts 1 5 (7)
Acquisitions 0 0 76
Deductions – write-offs (28) (11) (14)
Balance at end of period $ 205 $ 243 $ 282