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Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) - 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, 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 4,812 0 4,812
Other comprehensive income/(loss) $ 0 $ 0 0 0 60 60 [2]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) [3] 200,000 400,000        
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 0 $ 0 57 0 0 $ 57
Share repurchase programs (Note 16) (in shares) 0 (27,500,000)       (27,500,069)
Share repurchase programs (Note 16) $ 0 $ (5,952) 26 0 0 $ (5,926)
Dividends declared $ 0 $ 0 0 (2,044) 0 (2,044)
Balance (in shares) at Sep. 30, 2021 1,112,400,000 (468,000,000.0)        
Balance at Sep. 30, 2021 $ 2,781 $ (46,372) 4,947 54,094 (1,533) 13,917
Balance (in shares) at Jun. 30, 2021 1,112,500,000 (459,500,000)        
Balance at Jun. 30, 2021 $ 2,781 $ (44,542) 4,499 53,116 (1,551) 14,303
Net income 0 0 0 1,673 0 1,673
Other comprehensive income/(loss) $ 0 $ 0 0 0 18 18 [4]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) [3] (100,000) 100,000        
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 0 $ 5 22 0 0 $ 27
Share repurchase programs (Note 16) (in shares) 0 (8,600,000)       (8,604,239) [5]
Share repurchase programs (Note 16) $ 0 $ (1,835) 426 0 0 $ (1,409)
Dividends declared $ 0 $ 0 0 (695) 0 (695)
Balance (in shares) at Sep. 30, 2021 1,112,400,000 (468,000,000.0)        
Balance at Sep. 30, 2021 $ 2,781 $ (46,372) 4,947 54,094 (1,533) 13,917
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
Net income 0 0 0 5,360 0 5,360
Other comprehensive income/(loss) $ 0 $ 0 0 0 82 82 [2]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) [3] 200,000 400,000        
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 1 $ (10) 88 0 0 $ 79
Share repurchase programs (Note 16) (in shares) 0 (23,600,000)       (23,605,223)
Share repurchase programs (Note 16) $ 0 $ (5,565) (12) 0 0 $ (5,577)
Dividends declared $ 0 $ 0 0 (2,362) 0 (2,362)
Balance (in shares) at Sep. 30, 2022 1,112,600,000 (496,800,000)        
Balance at Sep. 30, 2022 $ 2,782 $ (53,309) 5,055 58,047 (832) 11,743
Balance (in shares) at Jun. 30, 2022 1,112,600,000 (487,500,000)        
Balance at Jun. 30, 2022 $ 2,781 $ (51,218) 5,030 56,958 (841) 12,710
Net income 0 0 0 1,895 0 1,895
Other comprehensive income/(loss) $ 0 $ 0 0 0 9 9 [4]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) [3] 0 200,000        
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 1 $ 11 25 0 0 $ 37
Share repurchase programs (Note 16) (in shares) 0 (9,500,000)       (9,490,339) [5]
Share repurchase programs (Note 16) $ 0 $ (2,102) 0 0 0 $ (2,102)
Dividends declared $ 0 $ 0 0 (806) 0 (806)
Balance (in shares) at Sep. 30, 2022 1,112,600,000 (496,800,000)        
Balance at Sep. 30, 2022 $ 2,782 $ (53,309) $ 5,055 $ 58,047 $ (832) $ 11,743
[1] AOCI = Accumulated Other Comprehensive Income/Loss (Note 9)
[2] Net of deferred taxes of ($17) million and ($26) million during the nine months ended September 30, 2022 and 2021, respectively.
[3] ESPP = employee stock purchase plan (Note 4)
[4] Net of deferred taxes of ($6) million and ($8) million during the three months ended September 30, 2022 and 2021, respectively.
[5] Includes an incremental 1,983,859 shares received upon final settlement in 2021 under accelerated share repurchase programs.