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Marketable and Other Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | $ 17,176 | $ 20,844
Total restricted cash | 3,605 | 2,652
Due in one year or less | 7,671 |
Due between one and five years | 4,358 |
Total available-for-sale debt securities with contractual maturities | 12,029 |
GM Cruise [Member] |  |
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | 2,100 | 2,300
GM Korea [Member] |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 504 | 616
Cash and Cash Equivalents [Member] |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 7,469 | 7,254
Total available-for-sale debt securities with contractual maturities | 6,755 | 10,423
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 2,952 | 3,167
Marketable Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 6,021 | 5,966
Restricted cash - cash equivalents [Member] |  |
Marketable Securities [Line Items] |  |
Cash and cash equivalents | 237 | 260
Restricted cash - cash equivalents [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 3,368 | 2,392
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 | 3,798 | 4,656
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 | 1,231 | 1,230
Corporate debt [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,683 | 3,791
Corporate debt [Member] | Marketable Debt Securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,482 | 3,478
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 | 747 | 695
Sovereign debt [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 274 | 1,976
Sovereign debt [Member] | Marketable Debt Securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 561 | $ 563

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