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Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Stock Incentive Awards Units Outstanding (Roll Forward)
Units outstanding at beginning of period (in shares)	48,100,000
Granted (in shares)	8,900,000
Settled (in shares)	(11,600,000)
Forfeited or expired (in shares)	(3,900,000)
Units outstanding at end of period (in shares)	41,500,000	48,100,000
Stock Incentive Awards Weighted Average Grant Date Fair Value (Per Share) [Roll Forward]
Weighted-average grant date fair value, Units outstanding at beginning of period (in dollars per share)	$ 19.81
Weighted-average grant date fair value, granted (in dollars per share)	27.89
Weighted-average grant date fair value, settled (in dollars per share)	28.78
Weighted-average grant date fair value, forfeited or expired (in dollars per share)	30.87
Weighted-average grant date fair value, Units outstanding at end of period (in dollars per share)	$ 19.81	$ 19.81		$ 19.17
Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Terms in years, Outstanding	10 months 24 days	1 year 3 months 18 days
Compensation expense	$ 456	$ 316	$ 585
Weighted-average period for total unrecognized compensation expense for nonvested equity awards	1 year 1 month 6 days
Unrecognized compensation expense				$ 182
Fair value of stock incentive awards vested	$ 287	$ 317	$ 421
Restricted Stock Units (RSUs)
Stock Incentive Plans Narratives [Abstract]
Service period	3 years
Performance Share Units (PSUs)
Stock Incentive Plans Narratives [Abstract]
Performance period	3 years
Stock options
Stock Incentive Plans Narratives [Abstract]
Expiration period	10 years
Remaining Contractual Term [Abstract]
Dividend yield	3.90%	3.69%	4.43%
Expected volatility	28.00%	28.00%	25.00%
Risk-free interest rate	2.62%	2.73%	1.97%
Expected option life	6 years	5 years 11 months 23 days	5 years 10 months 2 days
Performance-based Employee Stock Options
Stock Incentive Plans Narratives [Abstract]
Service period	55 months
Service-based Employee Stock Options | Minimum
Stock Incentive Plans Narratives [Abstract]
Service period	19 months
Service-based Employee Stock Options | Maximum
Stock Incentive Plans Narratives [Abstract]
Service period	3 years
Restricted Stock Awards (RSAs)
Stock Incentive Plans Narratives [Abstract]
Service period	3 years
Cruise Stock Incentive Awards
Stock Incentive Awards Units Outstanding (Roll Forward)
Granted (in shares)			0
Cruise Stock Incentive Awards | Restricted Stock Units (RSUs) | Maximum
Stock Incentive Plans Narratives [Abstract]
Service period	4 years
Cruise Stock Incentive Awards | Stock options
Stock Incentive Plans Narratives [Abstract]
Expiration period	10 years
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
Remaining Contractual Term [Abstract]
Weighted-average period for total unrecognized compensation expense for nonvested equity awards	7 years 10 months 24 days
Unrecognized compensation expense				$ 680
Total units outstanding (in shares)				70,100,000

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Net number of option and non-option equity instruments granted to participants.

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Weighted average fair value as of the grant date of stock options and non-option equity instruments that were not exercised or put into effect as a result of the occurrence of a terminating event.

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

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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