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Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reconciliation from Basic to Diluted Shares
The table below presents a reconciliation of weighted average shares used in the calculation of basic and diluted EPS.
Three Months EndedNine Months Ended
September 30,September 30,
(in millions)2020201920202019
Weighted average shares for basic EPS616 615 615 615 
Dilutive effect of shares issuable under stock-based
compensation plans
2 2 2 2 
Weighted average shares for diluted EPS618 617 617 617