Annual report pursuant to Section 13 and 15(d)

Schedule II - Schedule of Valuation and Qualifying Accounts (Details)

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Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance January 1, $ 14 $ 7 $ 10
Charged to Expenses 60 53 51
Write-offs/ Payments/ Other (59) (46) (54)
Balance December 31, 15 14 7
Deferred tax assets—valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance January 1, 70 66 53
Charged to Expenses 3 4 13
Write-offs/ Payments/ Other (19) 0 0
Balance December 31, $ 54 $ 70 $ 66