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Stock Plans (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Disclosure of share-based compensation arrangements by payment award
During the nine months ended September 30, 2020 and 2019, shares granted to eligible employees and the weighted-average grant date fair value per share related to RSU awards were as follows:
Number of
Shares
Granted
Weighted-Average Grant Date Fair Value Per RSU Award Granted
20201,712,750 $    85.81 
20191,717,230 $  77.25 

Compensation expense related to RSU awards was as follows:
Compensation Expense Related to RSU Awards
(in millions)For the Nine Months Ended September 30,For the Three Months Ended September 30,
2020$ 98 $ 30 
2019$ 91 $ 27 
During the nine months ended September 30, 2020 and 2019, shares granted to eligible employees and the grant date fair value per share related to PSU awards were as follows:
Number of Shares GrantedPSU Grant Date Fair Value Subject to Other Performance Factors Per SharePSU Grant Date Fair Value Subject to TSR Performance Factor Per Share
2020671,220 $  86.04 $  80.36 
2019647,700 $  77.23 $ 83.59 
Compensation expense related to PSU awards was as follows:
Compensation Expense Related to PSU Awards
(in millions)For the Nine Months Ended September 30,For the Three Months Ended September 30,
2020$  30 ($  2)
2019$  43 $  10 
Schedule of assumptions used to determine the grant date fair value of the PSU awards subject to the TSR performance factor The following assumptions were used to determine the grant date fair value of the PSU awards subject to the TSR performance factor:
20202019
Risk-free interest rate (a)
1.4 %2.4 %
Expected volatility (b)
23.5 %21.4 %
(a) Based on the U.S. Treasury yield curve.
(b) Determined using the observed historical volatility.