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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2020 (in millions except for per share amounts):
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Balance, December 31, 2019 | 11 |  |  | $ | 76.01 |  |  | 4.4 |  | $ | 745 |
Granted | 2 |  |  | 120.47 |  |  |  |  |
Exercised | (5) |  |  | 68.14 |  |  |  |  | $ | 348 |
Cancelled | — |  |  | 115.47 |  |  |  |  |
Balance, December 31, 2020 | 8 |  |  | $ | 88.01 |  |  | 3.8 |  | $ | 464 |
Options exercisable at December 31, 2020 | 6 |  |  | $ | 75.35 |  |  | 2.8 |  | $ | 381 |
Schedule of Stock Option Valuation Assumptions | The weighted average fair value of options granted during the years ended December 31, 2020, 2019 and 2018, was $21.17, $19.25 and $16.07, respectively, using the Black-Scholes option pricing model with the assumptions below:
| 2020 |  | 2019 |  | 2018
Risk free interest rate | 0.4 | % |  | 2.2 | % |  | 2.5 | %
Volatility | 24.7 | % |  | 20.1 | % |  | 19.2 | %
Dividend yield | 1.2 | % |  | 1.2 | % |  | 1.3 | %
Weighted average expected life (years) | 4.1 |  | 4.1 |  | 4.2
Restricted Stock Unit, Activity | The following table summarizes the restricted stock units activity for the year ended December 31, 2020 (in millions except for per share amounts):
|  | Quantity |  | Weighted Average Fair Value
Balance, December 31, 2019 |  | 6 |  |  | $ | 127.23 |
Granted |  | 1 |  |  | $ | 127.14 |
Vested |  | (2) |  |  | $ | 124.21 |
Forfeited |  | — |  |  | $ | 129.72 |
Balance, December 31, 2020 |  | 5 |  |  | $ | 127.63 |

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- Definition Tabular disclosure of 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 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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