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Consolidated Statements of Changes in Common Shareholders' Equity - USD ($)
$ in Millions
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
 [1]
Total
Balance (in shares) at Dec. 31, 2018 1,111,700,000 (386,600,000)        
Balance at Dec. 31, 2018 $ 2,779 $ (30,674) $ 4,449 $ 45,284 $ (1,415) $ 20,423
Net income 0 0 0 5,919 0 5,919
Other comprehensive income/(loss) $ 0 $ 0 0 0 59 59 [2]
Conversion, stock option exercises, forfeitures, and other (in shares) 300,000 1,700,000        
Conversion, stock option exercises, forfeitures, and other $ 1 $ 82 46 0 0 129
Share repurchase programs (Note 18) (in shares) 0 (35,000,000.0)        
Share repurchase programs (Note 18) $ 0 $ (5,832) 28 0 0 (5,804)
Cash dividends declared $ 0 $ 0 0 (2,598) 0 (2,598)
Balance (in shares) at Dec. 31, 2019 1,112,000,000.0 (419,900,000)        
Balance at Dec. 31, 2019 $ 2,780 $ (36,424) 4,523 48,605 (1,356) 18,128
Net income 0 0 0 5,349 0 5,349
Other comprehensive income/(loss) $ 0 $ 0 0 0 (237) (237) [2]
Conversion, stock option exercises, forfeitures, and other (in shares) 200,000 1,100,000        
Conversion, stock option exercises, forfeitures, and other $ 1 $ 19 31 0 0 $ 51
Share repurchase programs (Note 18) (in shares) 0 (22,100,000)       (22,132,111)
Share repurchase programs (Note 18) $ 0 $ (4,015) 310 0 0 $ (3,705)
Cash dividends declared $ 0 $ 0 0 (2,628) 0 (2,628)
Balance (in shares) at Dec. 31, 2020 1,112,200,000 (440,900,000)        
Balance at Dec. 31, 2020 $ 2,781 $ (40,420) 4,864 51,326 (1,593) 16,958
Net income 0 0 0 6,523 0 6,523
Other comprehensive income/(loss) $ 0 $ 0 0 0 679 679 [2]
Conversion, stock option exercises, forfeitures, and other (in shares) 200,000 600,000        
Conversion, stock option exercises, forfeitures, and other $ 0 $ 1 91 0 0 $ 92
Share repurchase programs (Note 18) (in shares) 0 (33,300,000)       (33,337,620)
Share repurchase programs (Note 18) $ 0 $ (7,315) 24 0 0 $ (7,291)
Cash dividends declared $ 0 $ 0 0 (2,800) 0 (2,800)
Balance (in shares) at Dec. 31, 2021 1,112,400,000 (473,600,000)        
Balance at Dec. 31, 2021 $ 2,781 $ (47,734) $ 4,979 $ 55,049 $ (914) $ 14,161
[1] AOCI = Accumulated Other Comprehensive Income/Loss (Note 9)
[2] Net of deferred taxes of ($237) million, $75 million, and ($15) million during 2021, 2020, and 2019, respectively.