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Schedule II - Qualifying And Valuation Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Qualifying And Valuation Accounts
SCHEDULE II – Qualifying and Valuation accounts for each of the three years in the period ended December 31, 2019
Additions
Valuation and Qualifying Accounts (in millions)Balance at
beginning
of period		Charged to
costs and
expenses		(Credited)
charged
to other
accounts (1)		DeductionsBalance at
end of
period
Year ended December 31, 2019:
Allowance for doubtful accounts$110  18  (8) (8) $112  
Deferred tax asset valuation allowance$310  117  —  (7) $420  
Year ended December 31, 2018:
Allowance for doubtful accounts$120  4  (7) (7) $110  
Deferred tax asset valuation allowance (as restated)$483  20  (4) (189) $310  
Year ended December 31, 2017:
Allowance for doubtful accounts$127  4  8  (19) $120  
Deferred tax asset valuation allowance$150  350  —  (17) $483  
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(1)Valuation accounts of acquired or divested companies and foreign currency translation adjustments.
Reserves are deducted from assets to which they apply.