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Stock Plans (Details Textuals) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common shares unissued and available for grant | 14 | 9 | 12
Stock-based compensation expense | $ 247 | $ 280 | $ 288
Stock-based compensation expense, income tax benefit | $ 59 | 67 | 69
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options contractual term | 10 years |  |
Stock-based compensation, unrecognized compensation cost | $ 4 |  |
Weighted-average remaining vesting period | 1 year 6 months |  |
Intrinsic value for options exercised | $ 47 | 104 | 104
Cash received from exercise of stock options | 44 | 84 | 87
Income tax benefit related to stock option exercises | 7 | $ 18 | $ 18
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation, unrecognized compensation cost | $ 204 |  |
Weighted-average remaining vesting period | 2 years |  |
Vest percentage | 25.00% |  |
RSAs/RSUs Weighted-average grant date fair value of RSAs granted (in dollars per share) | $ 124.47 | $ 96.24 | $ 98.20
Total fair value of shares vested | $ 291 | $ 286 | $ 239
Liability-Based Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash paid upon vesting of PGs | $ 81 | $ 81 | $ 56
Service condition period | 3 years |  |

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