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