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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 10) [Member]
 [1]
Total
Shareholders' equity, beginning balance at Dec. 31, 2018 $ 2,779 $ 4,449 $ 45,284 $ (30,674) $ (1,415) $ 20,423
Common shares, beginning balance at Dec. 31, 2018 1,111,700,000     (386,600,000)    
Net income     1,391     1,391
Other comprehensive income/(loss)         37 37 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 (20)   $ 45   26
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     1,100,000    
Share repurchases (Note 18)   (500)   $ (3,009)   $ (3,509)
Share repurchases (Note 18) (shares)       (18,100,000)   (18,149,450) [3]
Cash dividends declared     (626)     $ (626)
Shareholders' equity, ending balance at Mar. 31, 2019 $ 2,780 3,929 46,049 $ (33,638) (1,378) 17,742
Common shares, ending balance at Mar. 31, 2019 1,112,000,000.0     (403,600,000)    
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)   692,100,651
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 18)   (400)   $ (2,556)   $ (2,956)
Share repurchases (Note 18) (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)   678,558,571
[1] AOCI = Accumulated Other Comprehensive Income/(Loss) (Note 9)
[2] Net of deferred taxes of ($7) million and ($4) million during the three months ended March 31, 2020, and 2019, respectively.
[3] Includes 8,786,380 and 11,795,930 shares repurchased in February 2020 and 2019, respectively, under accelerated share repurchase programs.