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Marketable and Other Securities - Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	$ 18,060
Total cash and cash equivalents	28,228	$ 19,069
Cash and cash equivalents	267	292
Total restricted cash	4,412	3,874
Due in one year or less	15,333
Due between one and five years	2,727
Total available-for-sale debt securities with contractual maturities	18,060
Marketable securities pending cash settlement	505
Cruise [Member]
Marketable Securities [Line Items]
Total cash and cash equivalents	1,200	2,300
GM Korea [Member]
Marketable Securities [Line Items]
Cash and time deposits	0	248
Cash and cash equivalents [Member]
Marketable Securities [Line Items]
Cash and time deposits	13,203	6,828
Total available-for-sale debt securities with contractual maturities	9,447	9,470
Total available-for-sale debt securities with contractual maturities	9,447	9,470
Cash and cash equivalents [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Money market funds	5,578	2,771
Marketable debt securities [Member]
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	9,254	4,174
Total available-for-sale debt securities with contractual maturities	9,254	4,174
Marketable debt securities [Member] | Cruise [Member]
Marketable Securities [Line Items]
Total available-for-sale debt securities with contractual maturities	960	266
Total available-for-sale debt securities with contractual maturities	960	266
Other current assets [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Money market funds	4,145	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	3,879	1,484
Total available-for-sale debt securities with contractual maturities	3,879	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	3,435	226
Total available-for-sale debt securities with contractual maturities	3,435	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	3,318	5,863
Total available-for-sale debt securities with contractual maturities	3,318	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	3,552	2,932
Total available-for-sale debt securities with contractual maturities	3,552	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	641	681
Total available-for-sale debt securities with contractual maturities	641	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	2,250	2,123
Total available-for-sale debt securities with contractual maturities	2,250	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	1,626	335
Total available-for-sale debt securities with contractual maturities	$ 1,626	$ 335

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