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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Changes, Net of Tax, in Accumulated Other Comprehensive Loss
Changes, net of tax, in accumulated other comprehensive loss, were as follows:
Currency Translation Adjustments
Other CurrencyAccumulated Other
Cash FlowNet InvestmentTranslationComprehensive
(MILLIONS OF DOLLARS)HedgesHedgesAdjustmentsBenefit PlansLoss
Balance, December 31, 2018$(4) $10  $(621) $(14) $(629) 
Other comprehensive income, net of tax—   23  —  31  
Balance, March 31, 2019$(4) $18  $(598) $(14) $(598) 
Balance, December 31, 2019$—  $21  $(724) $(23) $(726) 
Other comprehensive (loss)/income, net of tax(28) 17  (44) —  

(55) 
Balance, March 31, 2020$(28) $38  $(768) $(23) $(781)