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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.

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