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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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