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Stock Incentive Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Compensation expense |  | $ 94 |  | $ 139 | $ 172 | $ 204 |
Unrecognized compensation expense |  | 423 |  |  | $ 423 |  |
Weighted-average period for total unrecognized compensation expense for nonvested equity awards |  |  |  |  | 1 year 8 months 12 days |  |
Cruise Stock Incentive Awards |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Cash used to settle awards |  | $ 200 | $ 0 |  |  |  |
Cruise Stock Incentive Awards | Stock options |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |
Dividend yield |  | 0.00% |  | 0.00% |  |  |
Expected volatility rate |  | 57.30% |  | 55.00% |  |  |
Risk-free interest rate |  | 2.47% |  | 0.78% |  |  |
Expected option life |  | 6 years 6 months 25 days |  | 6 years 3 months |  |  |
Cruise Stock Incentive Awards | Stock options | Minimum |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Service period |  |  |  |  | 4 years |  |
Cruise Stock Incentive Awards | Stock options | Maximum |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Service period |  |  |  |  | 10 years |  |
Cruise Stock Incentive Awards | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Numbers of awards that vested immediately (in shares) | 31.0 |  |  |  |  |  |
Total units outstanding (in shares) |  | 60.4 |  |  | 60.4 |  | 66.2
Cruise Stock Incentive Awards | Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Service period | 4 years |  |  |  |  |  |
Cruise Stock Incentive Awards | Stock options and RSUs |  |  |  |  |  |  |
Stock Incentive Plans Narratives [Abstract] |  |  |  |  |  |  |
Compensation expense |  | $ 158 |  |  | $ 1,300 |  |
Unrecognized compensation expense |  | $ 1,900 |  |  | $ 1,900 |  |
Weighted-average period for total unrecognized compensation expense for nonvested equity awards |  |  |  |  | 1 year 8 months 12 days |  |
Total units outstanding (in shares) |  | 85.0 |  |  | 85.0 |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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