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Stock Compensation Plans - Stock Option Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of Options (in thousands) |  |  |
Outstanding at beginning of year (in shares) | 5,490 |  |
Granted (in shares) | 1,089 |  |
Exercised (in shares) | (733) |  |
Forfeited (in shares) | 0 |  |
Expired (in shares) | 0 |  |
Outstanding at end of year (in shares) | 5,846 | 5,490 |
Number of Options (in thousands), Outstanding, fully vested and expected to vest (in shares) | 5,836 |  |
Number of Options (in thousands), Exercisable at end of year (in shares) | 3,921 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in USD per share) | $ 40.84 |  |
Granted (in USD per share) | 49.01 |  |
Exercised (in USD per share) | 32.29 |  |
Forfeited (in USD per share) | 0 |  |
Expired (in USD per share) | 0 |  |
Outstanding at end of year (in USD per share) | 43.43 | $ 40.84 |
Weighted Average Exercise Price, Outstanding, fully vested and expected to vest (in USD per share) | 64.77 |  |
Weighted Average Exercise Price, Exercisable at end of year (in USD per share) | $ 40.00 |  |
Weighted Average Remaining Contractual Term, Outstanding at end of year | 6 years 3 months 18 days |  |
Weighted Average Remaining Contractual Term, Outstanding, fully vested and expected to vest | 6 years 3 months 18 days |  |
Weighted Average Remaining Contractual Term, Exercisable at end of year | 5 years 2 months 12 days |  |
Aggregate Intrinsic Value, Outstanding at end of year | $ 101 |  |
Aggregate Intrinsic Value, Outstanding, fully vested and expected to vest | 98 |  |
Aggregate Intrinsic Value, Exercisable at end of year | $ 81 |  |
Employee Stock Option |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Expected dividend yield | 2.50% | 1.80% | 1.90%
Expected annualized spot volatility minimum | 20.70% | 20.80% | 21.80%
Expected annualized spot volatility maximum | 36.70% | 36.50% | 37.90%
Weighted average annualized volatility | 29.30% | 29.00% | 29.50%
Risk-free spot rate minimum | 2.40% | 1.50% | 0.40%
Risk-free spot rate maximum | 2.60% | 2.90% | 2.40%
Expected term | 5 years 10 months 24 days | 5 years 8 months 12 days | 5 years

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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