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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 16,357 |
Total cash and cash equivalents | 21,609 | $ 19,992
Cash and cash equivalents | 405 | 269
Total restricted cash | 3,267 | 3,125
Due in one year or less | 13,568 |
Due between one and five years | 2,789 |
Total available-for-sale debt securities with contractual maturities | 16,357 |
Cruise |  |
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | 2,200 | 761
Cash and cash equivalents |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 7,294 | 8,010
Total available-for-sale debt securities with contractual maturities | 9,202 | 6,897
Total available-for-sale debt securities with contractual maturities | 9,202 | 6,897
Cash and cash equivalents | Level 1 |  |
Marketable Securities [Line Items] |  |
Money market funds | 5,113 | 5,085
Marketable debt securities |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 7,771 | 9,046
Total available-for-sale debt securities with contractual maturities | 7,771 | 9,046
Marketable debt securities | Cruise |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 1,900 | 943
Total available-for-sale debt securities with contractual maturities | 1,900 | 943
Other current assets | Level 1 |  |
Marketable Securities [Line Items] |  |
Money market funds | 2,862 | 2,856
U.S. government and agencies | Cash and cash equivalents | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 631 | 1,370
Total available-for-sale debt securities with contractual maturities | 631 | 1,370
U.S. government and agencies | Marketable debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 927 | 1,771
Total available-for-sale debt securities with contractual maturities | 927 | 1,771
Corporate debt | Cash and cash equivalents | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 5,516 | 3,476
Total available-for-sale debt securities with contractual maturities | 5,516 | 3,476
Corporate debt | Marketable debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,099 | 3,630
Total available-for-sale debt securities with contractual maturities | 3,099 | 3,630
Mortgage and asset-backed | Marketable debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 594 | 632
Total available-for-sale debt securities with contractual maturities | 594 | 632
Sovereign debt | Cash and cash equivalents | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,055 | 2,051
Total available-for-sale debt securities with contractual maturities | 3,055 | 2,051
Sovereign debt | Marketable debt securities | Level 2 |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,151 | 3,013
Total available-for-sale debt securities with contractual maturities | $ 3,151 | $ 3,013

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