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Equity - Stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Stock options, Number of Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 2,079 |  |
Granted (in shares) |  |  | 247 | 215 |
Exercised (in shares) |  |  | (129) |  |
Cancelled (in shares) |  |  | (56) |  |
Outstanding at the end of the period (in shares) | 2,141 |  | 2,141 |  | 2,079
Exercisable at the end of the period (in shares) | 1,696 |  | 1,696 |  |
Stock options, Weighted Average Exercise Price per Share |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 80.25 |  |
Granted (in dollars per share) |  |  | 91.85 |  |
Exercised (in dollars per share) |  |  | 34.09 |  |
Cancelled (in dollars per share) |  |  | 113.73 |  |
Outstanding at the end of the period (in dollars per share) | $ 83.49 |  | 83.49 |  | $ 80.25
Exercisable at the end of the period (in dollars per share) | $ 76.92 |  | $ 76.92 |  |
Additional information pertaining to stock options |  |  |  |  |
Average Remaining Contractual Term, Outstanding |  |  | 5 years 5 months 15 days |  | 5 years 6 months 3 days
Average Remaining Contractual Term, Exercisable |  |  | 4 years 7 months 17 days |  |
Aggregate Intrinsic Value, Outstanding (in dollars) | $ 22 |  | $ 22 |  | $ 42
Aggregate Intrinsic Value, Exercisable (in dollars) | 22 |  | 22 |  |
Cash received from exercise of stock options |  |  | $ 4 |  |
Weighted average grant date fair value of stock options granted (per share) |  |  | $ 14.02 | $ 24.01 |
Total intrinsic value of stock options exercised | 1 | $ 1 | $ 7 | $ 12 |
Stock options |  |  |  |  |
Share-based compensation |  |  |  |  |
Term of award |  |  | 10 years |  |
Period of vesting |  |  | 3 years |  |
Required service period |  |  | 1 year |  |
Assumptions used to measure the fair value of awards |  |  |  |  |
Expected life |  |  | 5 years 6 months | 5 years 6 months |
Risk-free interest rate (as a percent) |  |  | 2.50% | 2.50% |
Expected volatility (as a percent) |  |  | 19.70% | 19.80% |
Expected dividend yield (as a percent) |  |  | 2.70% | 1.80% |
Additional information pertaining to stock options |  |  |  |  |
Unrecognized compensation cost | $ 3 |  | $ 3 |  |
Weighted-average period for amortization of unrecognized compensation cost |  |  | 1 year 6 months |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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