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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, 2017 $ 2,778 $ 4,476 $ 41,317 $ (22,574) $ (1,141) $ 24,856
Common shares, beginning balance at Dec. 31, 2017 1,111,400,000     (330,500,000)    
Net income 5,966 5,966
Other comp. income/(loss) 26 26 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 65 $ 33 99
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     1,100,000    
Share repurchases (Note 18) (92) $ (8,133) (8,225)
Share repurchases (Note 18) (shares)     (57,200,000)    
Cash dividends declared (2,299) (2,299)
Reclassification due to ASU 2018-02 adoption [3]     300   (300)  
Shareholders' equity, ending balance at Dec. 31, 2018 $ 2,779 4,449 45,284 $ (30,674) (1,415) 20,423
Common shares, ending balance at Dec. 31, 2018 1,111,700,000     (386,600,000)    
Net income 5,919 5,919
Other comp. income/(loss) 59 59 [2]
Conversion, stock option exercises, forfeitures, and other $ 1 46 $ 82 129
Conversion, stock option exercises, forfeitures, and other (shares) 300,000     1,700,000    
Share repurchases (Note 18) 28 $ (5,832) $ (5,804)
Share repurchases (Note 18) (shares)     (35,000,000.0)   (34,994,369)
Cash dividends declared (2,598) $ (2,598)
Shareholders' equity, ending balance at Dec. 31, 2019 $ 2,780 4,523 48,605 $ (36,424) (1,356) $ 18,128
Common shares, ending balance at Dec. 31, 2019 1,112,000,000.0     (419,900,000)   692,100,651
Net income 5,349 $ 5,349
Other comp. income/(loss) (237) (237) [2]
Conversion, stock option exercises, forfeitures, and other $ 1 31 $ 19 51
Conversion, stock option exercises, forfeitures, and other (shares) 200,000     1,100,000    
Share repurchases (Note 18) 310 $ (4,015) $ (3,705)
Share repurchases (Note 18) (shares)       (22,100,000)   (22,132,111)
Cash dividends declared (2,628) $ (2,628)
Shareholders' equity, ending balance at Dec. 31, 2020 $ 2,781 $ 4,864 $ 51,326 $ (40,420) $ (1,593) $ 16,958
Common shares, ending balance at Dec. 31, 2020 1,112,200,000     (440,900,000)   671,351,360
[1] AOCI = Accumulated Other Comprehensive Income/Loss (Note 9)
[2] Net of deferred taxes of $75 million, ($15) million, and ($22) million during 2020, 2019, and 2018, respectively.
[3] ASU 2018-02 is the Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows entities the option to reclassify from accumulated other comprehensive income to retained earnings the income tax effects that remain stranded in AOCI resulting from the application of the Tax Cuts and Jobs Act.