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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	$ 17,596
Total cash and cash equivalents	22,920	$ 19,992
Cash and cash equivalents	483	269
Total restricted cash	4,445	3,125
Due in one year or less	14,692
Due between one and five years	2,904
Total available-for-sale debt securities with contractual maturities	17,596
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	8,255	8,010
Total available-for-sale debt securities with contractual maturities	11,991	6,897
Total available-for-sale debt securities with contractual maturities	11,991	6,897
Cash and cash equivalents | Level 1
Marketable Securities [Line Items]
Money market funds	2,674	5,085
Marketable debt securities
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	6,211	9,046
Total available-for-sale debt securities with contractual maturities	6,211	9,046
Marketable debt securities | Cruise
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	2,100	943
Total available-for-sale debt securities with contractual maturities	2,100	943
Other current assets | Level 1
Marketable Securities [Line Items]
Money market funds	3,962	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	2,029	1,370
Total available-for-sale debt securities with contractual maturities	2,029	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	676	1,771
Total available-for-sale debt securities with contractual maturities	676	1,771
Corporate debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	5,609	3,476
Total available-for-sale debt securities with contractual maturities	5,609	3,476
Corporate debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	3,217	3,630
Total available-for-sale debt securities with contractual maturities	3,217	3,630
Mortgage and asset-backed | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	567	632
Total available-for-sale debt securities with contractual maturities	567	632
Sovereign debt | Cash and cash equivalents | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	4,353	2,051
Total available-for-sale debt securities with contractual maturities	4,353	2,051
Sovereign debt | Marketable debt securities | Level 2
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	1,751	3,013
Total available-for-sale debt securities with contractual maturities	$ 1,751	$ 3,013

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