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Equity - Stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Stock options, Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 2,238 |  |
Granted (in shares) | 358 | 336 |
Exercised (in shares) | (154) |  |
Cancelled (in shares) | (27) |  |
Outstanding at the end of the period (in shares) | 2,415 |  | 2,238
Exercisable at the end of the period (in shares) | 1,775 |  |
Stock options, Weighted Average Exercise Price per Share |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 86.55 |  |
Granted (in dollars per share) | 87.12 |  |
Exercised (in dollars per share) | 56.35 |  |
Cancelled (in dollars per share) | 94.39 |  |
Outstanding at the end of the period (in dollars per share) | 88.68 |  | $ 86.55
Exercisable at the end of the period (in dollars per share) | $ 88.90 |  |
Additional information pertaining to stock options |  |  |
Average Remaining Contractual Term, Outstanding | 5 years 10 months 20 days |  | 5 years 1 month 24 days
Average Remaining Contractual Term, Exercisable | 4 years 7 months 28 days |  |
Aggregate Intrinsic Value, Outstanding (in dollars) | $ 20 |  | $ 14
Aggregate Intrinsic Value, Exercisable (in dollars) | 19 |  |
Cash received from exercise of stock options | $ 9 |  |
Weighted average grant date fair value of stock options granted (per share) | $ 12.31 | $ 11.48 |
Total intrinsic value of stock options exercised | $ 5 | $ 4 |
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) | 0.60% | 1.40% |
Expected volatility (as a percent) | 23.20% | 19.80% |
Expected dividend yield (as a percent) | 2.90% | 2.90% |
Additional information pertaining to stock options |  |  |
Unrecognized compensation cost | $ 6 |  |
Weighted-average period for amortization of unrecognized compensation cost | 1 year 10 months 24 days |  |

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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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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