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Stock Incentive Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Incentive Plans Narratives [Abstract]
Compensation expense			$ 340	$ 419	$ 391
Unrecognized compensation expense			$ 249
Weighted-average period for total unrecognized compensation expense for nonvested equity awards			1 year 4 months 24 days
Fair value of stock incentive awards vested			$ 425	$ 307	$ 258
Performance Share Units (PSUs)
Stock Incentive Plans Narratives [Abstract]
Performance period			3 years
Stock options
Stock Incentive Plans Narratives [Abstract]
Expiration period			10 years
Dividend yield			1.90%	1.60%	1.67%
Expected volatility rate			34.00%	41.00%	47.80%
Risk-free interest rate			3.70%	1.88%	0.76%
Expected option life			6 years	6 years	6 years
Performance-based Employee Stock Options
Stock Incentive Plans Narratives [Abstract]
Service period			55 months
Service-based Employee Stock Options | Maximum
Stock Incentive Plans Narratives [Abstract]
Service period			3 years
Restricted Stock Units (RSUs)
Stock Incentive Plans Narratives [Abstract]
Service period			3 years
Cruise Stock Incentive Awards
Stock Incentive Plans Narratives [Abstract]
Cash used to settle awards		$ 0	$ 300	$ 600
Cruise Stock Incentive Awards | Stock options
Stock Incentive Plans Narratives [Abstract]
Expiration period			10 years
Numbers of options forfeited (in shares)			14.6
Numbers of options vested (in shares)			9.8
Weighted-average remaining contractual term			2 years 9 months 18 days
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 | Stock options and RSUs
Stock Incentive Plans Narratives [Abstract]
Compensation expense			$ 400	$ 1,600
Weighted-average period for total unrecognized compensation expense for nonvested equity awards			2 years 10 months 24 days
Cruise Stock Incentive Awards | Restricted Stock Units (RSUs)
Stock Incentive Plans Narratives [Abstract]
Unrecognized compensation expense			$ 700
Numbers of awards that vested immediately (in shares)	31.0
Cruise Stock Incentive Awards | Restricted Stock Units (RSUs) | Maximum
Stock Incentive Plans Narratives [Abstract]
Service period	4 years

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The total fair value of options and non-option equity instruments that vested during the period.

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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.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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