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Capital Stock - Additional Information (Detail) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares Directors shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | Feb. 01, 2021 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2019 USD ($) | Oct. 31, 2017 USD ($)
Capital Structure [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized | shares | 1,800,000,000 | 1,800,000,000 |  |  |  |  |
Repurchase of common stock, shares | shares | 3,287,000 | 7,949,000 | 14,070,000.000 |  |  |  |
Repurchase price of common stock, per share | $ / shares | $ 134.18 | $ 129.71 | $ 108.74 |  |  |  |
Share repurchase program authorized amount |  |  |  |  | $ 6,000,000,000 | $ 6,000,000,000 | $ 6,000,000,000
Share repurchase program, remaining authorized repurchase amount | $ 2,800,000,000 |  |  |  | $ 2,000,000,000 | $ 2,000,000,000 | $ 2,000,000,000
Subsequent Event [Member] |  |  |  |  |  |  |
Capital Structure [Line Items] |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  | $ 8,800,000,000 |  |  |
Share repurchase program, remaining authorized repurchase amount |  |  |  | 2,800,000,000 |  |  |
Stock repurchase program additional authorized amount |  |  |  | $ 6,000,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Capital Structure [Line Items] |  |  |  |  |  |  |
Number of directors as per the amended and restated by-laws | Directors | 3 |  |  |  |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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