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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, 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     4,516     4,516
Other comprehensive income/(loss)         110 110 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 28   $ 67   96
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     1,500,000    
Share repurchases (Note 18)   28   $ (5,232)   $ (5,204)
Share repurchases (Note 18) (shares)       (31,400,000)   (31,412,157)
Cash dividends declared     (1,925)     $ (1,925)
Shareholders' equity, ending balance at Sep. 30, 2019 $ 2,780 4,505 47,875 $ (35,839) (1,305) 18,016
Common shares, ending balance at Sep. 30, 2019 1,112,000,000.0     (416,500,000)    
Shareholders' equity, beginning balance at Jun. 30, 2019 $ 2,780 3,954 46,997 $ (34,262) (1,298) 18,171
Common shares, beginning balance at Jun. 30, 2019 1,112,000,000.0     (407,100,000)    
Net income     1,555     1,555
Other comprehensive income/(loss)         (7) (7) [3]
Conversion, stock option exercises, forfeitures, and other   23   $ 7   30
Conversion, stock option exercises, forfeitures, and other (shares)       100,000    
Share repurchases (Note 18)   528   $ (1,584)   $ (1,056)
Share repurchases (Note 18) (shares)       (9,500,000)   (9,529,733) [4]
Cash dividends declared     (677)     $ (677)
Shareholders' equity, ending balance at Sep. 30, 2019 $ 2,780 4,505 47,875 $ (35,839) (1,305) 18,016
Common shares, ending balance at Sep. 30, 2019 1,112,000,000.0     (416,500,000)    
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     3,969     $ 3,969
Other comprehensive income/(loss)         5 5 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 16   $ 10   27
Conversion, stock option exercises, forfeitures, and other (shares) 200,000     1,000,000.0    
Share repurchases (Note 18)   310   $ (3,266)   $ (2,956)
Share repurchases (Note 18) (shares)       (18,300,000)   (18,351,368)
Cash dividends declared     (1,974)     $ (1,974)
Shareholders' equity, ending balance at Sep. 30, 2020 $ 2,781 4,849 50,600 $ (39,680) (1,351) $ 17,199
Common shares, ending balance at Sep. 30, 2020 1,112,200,000     (437,200,000)   675,033,254
Shareholders' equity, beginning balance at Jun. 30, 2020 $ 2,781 4,135 49,892 $ (38,984) (1,372) $ 16,452
Common shares, beginning balance at Jun. 30, 2020 1,112,300,000     (433,600,000)    
Net income     1,363     1,363
Other comprehensive income/(loss)         21 21 [3]
Conversion, stock option exercises, forfeitures, and other   4   $ 14   $ 18
Conversion, stock option exercises, forfeitures, and other (shares) (100,000)     400,000    
Share repurchases (Note 18)   710   $ (710)    
Share repurchases (Note 18) (shares)       (4,000,000.0)   (4,045,575) [4]
Cash dividends declared     (655)     $ (655)
Shareholders' equity, ending balance at Sep. 30, 2020 $ 2,781 $ 4,849 $ 50,600 $ (39,680) $ (1,351) $ 17,199
Common shares, ending balance at Sep. 30, 2020 1,112,200,000     (437,200,000)   675,033,254
[1] AOCI = Accumulated Other Comprehensive Income/(Loss) (Note 9)
[2] Net of deferred taxes of ($18) million and ($35) million during the nine months ended September 30, 2020 and 2019, respectively.
[3] Net of deferred taxes of ($6) million and ($4) million during the three months ended September 30, 2020 and 2019, respectively.
[4] Includes an incremental 4,045,575 and 3,172,900 shares received upon final settlement in July 2020 and August 2019, respectively, under accelerated share repurchase programs.