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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |
Shares repurchased (in shares) | 1,900,000 |  |
Repurchase and retirement of shares of common stock | $ 300 |  |
Remaining shares authorized to be repurchased | $ 1,340 |  |
Capital shares reserved for future issuance | 33,000,000 | 37,000,000 |
Aggregate intrinsic value of options exercised | $ 247 | $ 184 | $ 128
Options exercised during period, exercise price range, lower range limit | $ 38.88 |  |
Options exercised during period, exercise price range, upper range limit | $ 169.42 |  |
Compensation cost not yet recognized | $ 99 |  |
Compensation cost not yet recognized, period for recognized | 1 year 6 months |  |
Restricted Stock Units (RSUs) |  |  |
Capital Stock [Line Items] |  |  |
Compensation cost not yet recognized | $ 63 |  |
Compensation cost not yet recognized, period for recognized | 1 year |  |
Weighted average grant date fair value, Granted (in dollars per share) | $ 150.23 | $ 117.44 |
Shares vested during the period | $ 47 |  |
Performance Stock Units (PSUs) |  |  |
Capital Stock [Line Items] |  |  |
Compensation cost not yet recognized | $ 15 |  |
Compensation cost not yet recognized, period for recognized | 1 year |  |
Weighted average grant date fair value, Granted (in dollars per share) | $ 153.67 |  |
Shares vested during the period | $ 0 |  |
Employee Stock Purchase Plans |  |  |
Capital Stock [Line Items] |  |  |
Percentage of closing stock price under ESPP | 95.00% |  |
Shares issued under the ESPP | 168,626 | 163,415 |

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