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Condensed Consolidated Statements of Changes in Common Shareholders' Equity - USD ($)
$ in Millions
Common Shares [Member]
Paid-in-Surplus [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income/(Loss) (Note 9) [Member]
 [1]
Total
Shareholders' equity, beginning balance at Dec. 31, 2019 $ 2,780 $ 4,523 $ 48,605 $ (36,424) $ (1,356) $ 18,128
Common shares, beginning balance at Dec. 31, 2019 1,112,000,000.0     (419,900,000)    
Net income     1,474     1,474
Other comprehensive income/(loss)         27 27 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 (11)   $ (12)   (22)
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     500,000    
Share repurchases (Note 15)   (400)   $ (2,556)   $ (2,956)
Share repurchases (Note 15) (shares)       (14,300,000)   (14,305,793) [3]
Cash dividends declared     (660)     $ (660)
Shareholders' equity, ending balance at Mar. 31, 2020 $ 2,781 4,112 49,419 $ (38,992) (1,329) 15,991
Common shares, ending balance at Mar. 31, 2020 1,112,300,000     (433,700,000)    
Shareholders' equity, beginning balance at Dec. 31, 2020 $ 2,781 4,864 51,326 $ (40,420) (1,593) $ 16,958
Common shares, beginning balance at Dec. 31, 2020 1,112,200,000     (440,900,000)   671,351,360
Net income     1,341     $ 1,341
Other comprehensive income/(loss)         (1) (1) [2]
Conversion, stock option exercises, forfeitures, and other   10   $ (4)   6
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     200,000    
Share repurchases (Note 15)       $ (1,402)   $ (1,402)
Share repurchases (Note 15) (shares)       (6,700,000)   (6,691,421) [3]
Cash dividends declared     (648)     $ (648)
Shareholders' equity, ending balance at Mar. 31, 2021 $ 2,781 $ 4,874 $ 52,019 $ (41,826) $ (1,594) $ 16,254
Common shares, ending balance at Mar. 31, 2021 1,112,500,000     (447,400,000)   665,134,519
[1] AOCI = Accumulated Other Comprehensive Income/Loss (Note 8)
[2] Net of deferred taxes of ($8) million and ($7) million during the three months ended March 31, 2021 and 2020, respectively.
[3] Includes 8,786,380 shares repurchased in February 2020 under accelerated share repurchase programs.