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Stock-Based Compensation - Stock Options (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Stock Option Program |  |
Balance at the beginning of the period | 33,675 |
Granted - Annual | 4,741 |
Exercised | (1,159) |
Forfeited | (41) |
Balance at the end of the period | 37,216 |
Options exercisable | 29,173 |
Options exercisable, exercise price | $ 146.86 |
Weighted average exercise price - Beginning balance | 151.15 |
Weighted average exercise price - Granted - Annual | 157.26 |
Weighted average exercise price - Exercised | 87.25 |
Weighted average exercise price - Forfeited | 193.77 |
Weighted average exercise price - Ending balance | $ 153.87 |
Weighted average remaining contractual life for options outstanding | 70 months |
Weighted average remaining contractual life for options exercisable | 58 months |
Aggregate intrinsic value for options outstanding | $ 359 |
Aggregate intrinsic value for options exercisable | $ 359 |
Expiration of annual grants | 10 years |
Compensation expense yet to be recognized | $ 107 |
Expense recognition period | 25 months |
Total intrinsic value of stock options exercised | $ 98 | $ 235
Cash received from options exercised | 100 | 162
Tax benefit realized from exercise of stock options | $ 20 | $ 49
Share- based compensation assumptions |  |
Weighted average exercise price | $ 157.24 |
Risk-free interest rate (as a percent) | 1.50% |
Dividend yield (as a percent) | 2.70% |
Expected volatility (as a percent) | 19.70% |
Expected life | 78 months |
Black-Scholes fair value | $ 21.58 |
Maximum |  |
Stock Option Program |  |
Vesting period | 3 years |
Minimum |  |
Stock Option Program |  |
Vesting period | 1 year |

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that 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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