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Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) - USD ($)
$ in Millions
Common Stock [Member]
Treasury Stock, Common [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
 [1]
Total
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] [3] $ 1 $ (10) 88 0 0 $ 79
Share repurchase programs (Note 15) (in shares) 0 (23,600,000)       (23,605,223)
Share repurchase programs (Note 15) $ 0 $ (5,565) (12) 0 0 $ (5,577)
Dividends declared $ 0 $ 0 0 (2,362) 0 (2,362)
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) 200,000 400,000 [3]        
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] [3] $ 1 $ 11 25 0 0 $ 37
Share repurchase programs (Note 15) (in shares) 0 (9,500,000)       (9,490,339)
Share repurchase programs (Note 15) $ 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
Balance (in shares) at Dec. 31, 2022 1,112,600,000 (500,200,000)        
Balance at Dec. 31, 2022 $ 2,782 $ (54,004) 5,080 58,887 (582) 12,163
Net income 0 0 0 4,727 0 4,727
Other comprehensive income/(loss) 0 0 0 0 85 85 [2]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 0 $ 34 86 0 0 $ 120
Share repurchase programs (Note 15) (in shares) 0 (3,500,000)       (3,515,284)
Share repurchase programs (Note 15) $ 0 $ (712) 0 0 0 $ (712)
Dividends declared $ 0 $ 0 0 (2,379) 0 (2,379)
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) 300,000 400,000 [3]        
Balance (in shares) at Sep. 30, 2023 1,112,900,000 (503,300,000)        
Balance at Sep. 30, 2023 $ 2,782 $ (54,682) 5,166 61,235 (497) 14,004
Balance (in shares) at Jun. 30, 2023 1,112,900,000 (503,500,000)        
Balance at Jun. 30, 2023 $ 2,782 $ (54,699) 5,128 60,500 (517) 13,194
Net income 0 0 0 1,528 0 1,528
Other comprehensive income/(loss) 0 0 0 0 20 20 [4]
Conversion, stock option exercises, forfeitures, ESPP, and other [b] [3] $ 0 $ 17 38 0 0 $ 55
Share repurchase programs (Note 15) (in shares) 0 0       0
Share repurchase programs (Note 15) $ 0 $ 0 0 0 0 $ 0
Dividends declared $ 0 $ 0 0 (793) 0 (793)
Conversion, stock option exercises, forfeitures, ESPP, and other [b] (in shares) 0 200,000 [3]        
Balance (in shares) at Sep. 30, 2023 1,112,900,000 (503,300,000)        
Balance at Sep. 30, 2023 $ 2,782 $ (54,682) $ 5,166 $ 61,235 $ (497) $ 14,004
[1] AOCI = Accumulated Other Comprehensive Income/Loss (Note 8)
[2] Net of deferred taxes of ($4) million and ($17) million during the nine months ended September 30, 2023 and 2022, respectively.
[3] ESPP = employee stock purchase plan (Note 3)
[4] Net of deferred taxes of ($1) million and ($6) million during the three months ended September 30, 2023 and 2022, respectively.