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Marketable and Other Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable Securities [Line Items] |  |
Total cash and cash equivalents | $ 18,435 | $ 15,512
Total restricted cash | 2,423 | 2,336
Due in one year or less | 6,777 |
Due between one and five years | 4,376 |
Total available-for-sale debt securities with contractual maturities | 11,153 |
GM Cruise [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 1,800 |
Cash and Cash Equivalents [Member] |  |
Marketable Securities [Line Items] |  |
Cash and time deposits | 7,144 | 6,962
Total available-for-sale debt securities with contractual maturities | 5,922 | 5,736
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 5,369 | 2,814
Marketable Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 5,916 | 8,313
Restricted cash - cash equivalents [Member] |  |
Marketable Securities [Line Items] |  |
Cash and cash equivalents | 198 | 219
Restricted cash - cash equivalents [Member] | Level 1 [Member] |  |
Marketable Securities [Line Items] |  |
Money market funds | 2,225 | 2,117
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 | 1,115 | 750
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 | 1,229 | 3,310
Corporate debt [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,774 | 3,032
Corporate debt [Member] | Marketable Debt Securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 3,416 | 3,665
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 | 685 | 635
Sovereign debt [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | 2,033 | 1,954
Sovereign debt [Member] | Marketable Debt Securities [Member] | Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Total available-for-sale debt securities with contractual maturities | $ 586 | $ 703

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