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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	$ 15,512
Total cash and cash equivalents	16,349	$ 20,067
Cash and cash equivalents	374	466
Total restricted cash	3,629	3,475
Due in one year or less	10,681
Due between one and five years	4,831
Total available-for-sale debt securities with contractual maturities	15,512
Cruise
Marketable Securities [Line Items]
Total cash and cash equivalents	2,600	1,600
Cash and cash equivalents
Marketable Securities [Line Items]
Cash and time deposits	6,979	7,881
Total available-for-sale debt securities with contractual maturities	6,255	8,148
Total available-for-sale debt securities with contractual maturities	6,255	8,148
Cash and cash equivalents | Level 1
Marketable Securities [Line Items]
Money market funds	3,114	4,038
Marketable debt securities
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	9,907	8,609
Total available-for-sale debt securities with contractual maturities	9,907	8,609
Marketable debt securities | Cruise
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,500	1,500
Total available-for-sale debt securities with contractual maturities	1,500	1,500
Other current assets | Level 1
Marketable Securities [Line Items]
Money market funds	3,255	3,009
U.S. government and agencies | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	630	722
Total available-for-sale debt securities with contractual maturities	630	722
U.S. government and agencies | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	2,844	2,071
Total available-for-sale debt securities with contractual maturities	2,844	2,071
Corporate debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	4,439	5,321
Total available-for-sale debt securities with contractual maturities	4,439	5,321
Corporate debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	3,630	3,396
Total available-for-sale debt securities with contractual maturities	3,630	3,396
Mortgage and asset-backed | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	600	575
Total available-for-sale debt securities with contractual maturities	600	575
Sovereign debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,186	2,105
Total available-for-sale debt securities with contractual maturities	1,186	2,105
Sovereign debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	2,833	2,567
Total available-for-sale debt securities with contractual maturities	$ 2,833	$ 2,567

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