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, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance January 1, $ 7 $ 10 $ 9
Charged to Expenses 53 51 56
Write-offs/ Payments/ Other (46) (54) (55)
Balance December 31, 14 7 10
Deferred tax assets—valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance January 1, 66 53 48
Charged to Expenses 4 13 4
Write-offs/ Payments/ Other 0 0 1
Balance December 31, $ 70 $ 66 $ 53