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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | $ 19,069 | $ 20,844
Cash and cash equivalents | 292 | 260
Total restricted cash | 3,874 | 2,652
Due in one year or less | 10,213 |
Due between one and five years | 2,750 |
Total available-for-sale debt securities with contractual maturities | 12,963 |
GM Korea |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 248 | 616
Cruise |  |
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | 2,300 | 2,300
Cash And Cash Equivalents |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 6,828 | 7,254
Total available-for-sale debt securities with contractual maturities | 9,470 | 10,423
Cash And Cash Equivalents | Level 2 | U.S. government and agencies |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 1,484 | 4,656
Cash And Cash Equivalents | Level 2 | Corporate Debt |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 5,863 | 3,791
Cash And Cash Equivalents | Level 2 | Sovereign Debt |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,123 | 1,976
Cash And Cash Equivalents | Level 1 |  |
Marketable Securities [Line Items] |  |
Money market funds | 2,771 | 3,167
Marketable Securities |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 4,174 | 5,966
Marketable Securities | Cruise |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 266 |
Marketable Securities | Level 2 | U.S. government and agencies |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 226 | 1,230
Marketable Securities | Level 2 | Corporate Debt |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,932 | 3,478
Marketable Securities | Level 2 | Sovereign Debt |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 335 | 563
Marketable Securities | Level 2 | Mortgage and asset-backed |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 681 | 695
Restricted cash - cash equivalents | Level 1 |  |
Marketable Securities [Line Items] |  |
Money market funds | $ 3,582 | $ 2,392

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