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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Changes in shares of common stock, treasury stock and common stock held in trust for employee benefit plans
Changes in shares of common stock, treasury stock and common stock held in trust for employee benefit plans were as follows:
In millionsCommon
Stock		Treasury
Stock		Common Stock
Held in Trust
Balance at December 31, 2018222.4 64.4 0.4 
Shares acquired— 8.1 — 
Shares issued— (0.8)(0.2)
Balance at December 31, 2019222.4 71.7 0.2 
Shares acquired— 3.9 — 
Shares issued— (0.8)(0.2)
Balance at December 31, 2020222.4 74.8 — 
Shares acquired— 5.7 — 
Shares issued0.1 (0.5)— 
Balance at December 31, 2021222.5 80.0 — 
Repurchases of common stock For the year ended December 31, 2021, we made the following purchases under the stock repurchase program:
In millions (except per share amounts)
For each quarter ended		Shares PurchasedAverage Cost
Per Share		Total Cost of
Repurchases
Remaining
Authorized
Capacity (1)
April 41.7 $247.35 $418 $1,576 
July 42.7 252.66 672 904 
October 30.6 231.57 138 766 
December 310.7 222.14 174 2,592 
Total5.7 244.73 $1,402 
(1) The remaining $592 million authorized capacity under the 2019 plan was calculated based on the cost to purchase the shares, but excludes commission expenses in accordance with the authorized plan.
Dividends per share paid to common shareholders Cash dividends per share paid to common shareholders for the last three years were as follows:
 Quarterly Dividends
 202120202019
First quarter$1.35 $1.311 $1.14 
Second quarter1.35 1.311 1.14 
Third quarter1.45 1.311 1.311 
Fourth quarter1.45 1.35 1.311 
Total$5.60 $5.28 $4.90