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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 21,299 |
Total cash and cash equivalents | 38,506 | $ 19,069
Cash and cash equivalents | 239 | 292
Total restricted cash | 2,660 | 3,874
Due in one year or less | 18,605 |
Due between one and five years | 2,694 |
Total available-for-sale debt securities with contractual maturities | 21,299 |
Cruise [Member] |  |
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | 1,500 | 2,300
GM Korea [Member] |  |
Marketable Securities [Line Items] |  |
Cash and time deposits |  | 248
Cash and cash equivalents [Member] |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 11,965 | 6,828
Total available-for-sale debt securities with contractual maturities | 14,346 | 9,470
Total available-for-sale debt securities with contractual maturities | 14,346 | 9,470
Cash and cash equivalents [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 12,195 | 2,771
Marketable debt securities [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 7,620 | 4,174
Total available-for-sale debt securities with contractual maturities | 7,620 | 4,174
Marketable debt securities [Member] | Cruise [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 877 | 266
Total available-for-sale debt securities with contractual maturities | 877 | 266
Other current assets [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 2,421 | 3,582
U.S. government and agencies [Member] | Cash and cash equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 5,011 | 1,484
Total available-for-sale debt securities with contractual maturities | 5,011 | 1,484
U.S. government and agencies [Member] | Marketable debt securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 1,810 | 226
Total available-for-sale debt securities with contractual maturities | 1,810 | 226
Corporate debt [Member] | Cash and cash equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 7,660 | 5,863
Total available-for-sale debt securities with contractual maturities | 7,660 | 5,863
Corporate debt [Member] | Marketable debt securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,104 | 2,932
Total available-for-sale debt securities with contractual maturities | 3,104 | 2,932
Mortgage and asset-backed [Member] | Marketable debt securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 667 | 681
Total available-for-sale debt securities with contractual maturities | 667 | 681
Sovereign debt [Member] | Cash and cash equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 1,675 | 2,123
Total available-for-sale debt securities with contractual maturities | 1,675 | 2,123
Sovereign debt [Member] | Marketable debt securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,039 | 335
Total available-for-sale debt securities with contractual maturities | $ 2,039 | $ 335

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