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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capital Stock [Line Items] |  |  |
Common and Preferred Stock, shares authorized (in shares) | 1,000,500,000 |  |
Preferred Stock, Shares Authorized | 500,000 |  |
Preferred stock, par per share | $ 1 |  |
Common stock, authorized (in shares) | 1,000,000,000 |  |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
Preferred stock, outstanding (in shares) | 0 |  |
Remaining shares authorized to be repurchased | $ 1,033 |  |
Capital shares reserved for future issuance | 28,000,000 | 31,000,000 |
Aggregate intrinsic value of options exercised | $ 258 | $ 294 | $ 247
Options exercised during period, exercise price range, lower range limit | $ 53.60 |  |
Options exercised during period, exercise price range, upper range limit | $ 216.35 |  |
Compensation cost not yet recognized | $ 99 |  |
Compensation cost not yet recognized, period for recognized | 1 year 4 months 24 days |  |
Restricted Stock Units (RSUs) |  |  |
Capital Stock [Line Items] |  |  |
Compensation cost not yet recognized | $ 68 |  |
Compensation cost not yet recognized, period for recognized | 1 year |  |
Weighted average grant date fair value, Granted (in dollars per share) | $ 208.96 | $ 175.96 |
Shares vested during the period | $ 55 |  |
Performance Stock Units (PSUs) |  |  |
Capital Stock [Line Items] |  |  |
Compensation cost not yet recognized | $ 16 |  |
Compensation cost not yet recognized, period for recognized | 1 year |  |
Weighted average grant date fair value, Granted (in dollars per share) | $ 217.73 |  |
Shares vested during the period | $ 9 |  |
Employee Stock Purchase Plans |  |  |
Capital Stock [Line Items] |  |  |
Percentage of closing stock price under ESPP | 95.00% |  |
Shares issued under the ESPP | 209,837 | 166,758 |

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