v3.20.4
Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Summary of Common Stock Purchases
The following provides the number of shares of our common stock purchased and the cost of purchases under our publicly announced share purchase plans, including our ASRs:
Year Ended December 31,
(SHARES IN MILLIONS, DOLLARS IN BILLIONS)2020
2019(a)
2018(b)
Shares of common stock purchased— 213 307 
Cost of purchase$— $8.9 $12.2 
(a)Represents shares purchased pursuant to the ASR with Goldman Sachs & Co. LLC entered into in February 2019, as well as open market share repurchases of $2.1 billion.
(b)Represents shares purchased pursuant to the ASR with Citibank entered into in March 2018, as well as open market share repurchases of $8.2 billion.