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Equity-Based Compensation - Stock Options (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable shares, end of year | 1,910 |  |
Exercisable, Weighted Average Per Share Exercise Price | $ 62.21 |  |
Exercise of common stock options | $ 63 | $ 67 | $ 52
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of awards | 10 years |  |
Outstanding shares, beginning of year | 3,938 |  |
Granted, shares | 684 |  |
Exercised, shares | (1,039) |  |
Forfeited or expired, shares | (40) |  |
Outstanding shares, end of year | 3,543 | 3,938 |
Exercisable shares, end of year | 1,910 |  |
Outstanding, Weighted Average Per Share Fair Value, beginning of year | $ 69.66 |  |
Granted, Weighted Average Per Share Fair Value | 126.01 |  |
Exercised, Weighted Average Per Share Fair Value | 116.18 |  |
Forfeited or expired, Weighted Average Per Share Fair Value | 102.11 |  |
Outstanding, Weighted Average Per Share Fair Value, end of year | 82.86 | $ 69.66 |
Exercisable, Weighted Average Per Share Exercise Price | $ 62.21 |  |
Weighted average remaining contractual term of stock options outstanding | 6 years 6 months |  |
Aggregate intrinsic value of stock options outstanding based on the market value of company's common stock | $ 130 |  |
Aggregate intrinsic value of stock options exercisable based on the market value of company's common stock | 106 |  |
Exercise of common stock options | 63 | $ 67 | 52
Aggregate intrinsic value of stock options exercised | $ 58 | $ 71 | $ 41
First Anniversary [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting (as a percent) | 25.00% |  |
Second Anniversary [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting (as a percent) | 25.00% |  |
Third Anniversary [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting (as a percent) | 50.00% |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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