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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	$ 11,499
Total cash and cash equivalents	17,365	$ 19,992
Cash and cash equivalents	509	269
Total restricted cash	4,286	3,125
Due in one year or less	8,490
Due between one and five years	3,009
Total available-for-sale debt securities with contractual maturities	11,499
Cruise
Marketable Securities [Line Items]
Total cash and cash equivalents	1,800	761
Cash and cash equivalents
Marketable Securities [Line Items]
Cash and time deposits	8,312	8,010
Total available-for-sale debt securities with contractual maturities	5,526	6,897
Total available-for-sale debt securities with contractual maturities	5,526	6,897
Cash and cash equivalents | Level 1
Marketable Securities [Line Items]
Money market funds	3,527	5,085
Marketable debt securities
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	6,575	9,046
Total available-for-sale debt securities with contractual maturities	6,575	9,046
Marketable debt securities | Cruise
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,800	943
Total available-for-sale debt securities with contractual maturities	1,800	943
Other current assets | Level 1
Marketable Securities [Line Items]
Money market funds	3,777	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	188	1,370
Total available-for-sale debt securities with contractual maturities	188	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	803	1,771
Total available-for-sale debt securities with contractual maturities	803	1,771
Corporate debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	4,100	3,476
Total available-for-sale debt securities with contractual maturities	4,100	3,476
Corporate debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	3,212	3,630
Total available-for-sale debt securities with contractual maturities	3,212	3,630
Mortgage and asset-backed | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	566	632
Total available-for-sale debt securities with contractual maturities	566	632
Sovereign debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,238	2,051
Total available-for-sale debt securities with contractual maturities	1,238	2,051
Sovereign debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,994	3,013
Total available-for-sale debt securities with contractual maturities	$ 1,994	$ 3,013

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