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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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- Definition The weighted average grant date fair value of options and equity instruments other than options issued during the period, including both vested and nonvested instruments. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans including option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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