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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.

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