Cash, Cash Equivalents, and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 |
Items measured at fair value [Line Items] | | | | |
Total cash and cash equivalents | $ 13,340 | $ 14,272 | $ 14,686 | $ 10,757 |
Fair Value, Measurements, Recurring [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 1,544 | 596 | | |
Marketable securities | 20,825 | 20,904 | | |
Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member] | Investment Type [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash, time deposits, and money market funds | 11,796 | 13,676 | | |
U.S. government | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 599 | 115 | | |
Marketable securities | 5,706 | 1,921 | | |
U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 4 | 22 | | |
Marketable securities | 4,638 | 6,409 | | |
Non-U.S. government and agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 831 | 439 | | |
Marketable securities | 5,943 | 8,283 | | |
Corporate debt | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 110 | 20 | | |
Marketable securities | 4,249 | 3,663 | | |
Equities | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 198 | 240 | | |
Other marketable securities | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 91 | 388 | | |
Operating Segments [Member] | Automotive | | | | |
Items measured at fair value [Line Items] | | | | |
Total cash and cash equivalents | 7,655 | 5,386 | | |
Operating Segments [Member] | Automotive | Fair Value, Measurements, Recurring [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 1,210 | 330 | | |
Marketable securities | 16,645 | 18,181 | | |
Operating Segments [Member] | Automotive | Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member] | Investment Type [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash, time deposits, and money market funds | 6,445 | 5,056 | | |
Operating Segments [Member] | Automotive | U.S. government | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 599 | 115 | | |
Marketable securities | 3,982 | 1,623 | | |
Operating Segments [Member] | Automotive | U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 22 | | |
Marketable securities | 3,284 | 5,240 | | |
Operating Segments [Member] | Automotive | Non-U.S. government and agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 551 | 173 | | |
Marketable securities | 5,423 | 7,451 | | |
Operating Segments [Member] | Automotive | Corporate debt | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 60 | 20 | | |
Marketable securities | 3,709 | 3,279 | | |
Operating Segments [Member] | Automotive | Equities | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 198 | 240 | | |
Operating Segments [Member] | Automotive | Other marketable securities | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 49 | 348 | | |
Operating Segments [Member] | Financial Services | | | | |
Items measured at fair value [Line Items] | | | | |
Total cash and cash equivalents | 5,675 | 8,886 | | |
Operating Segments [Member] | Financial Services | Fair Value, Measurements, Recurring [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 334 | 266 | | |
Marketable securities | 4,180 | 2,723 | | |
Operating Segments [Member] | Financial Services | Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member] | Investment Type [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash, time deposits, and money market funds | 5,341 | 8,620 | | |
Operating Segments [Member] | Financial Services | U.S. government | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 1,724 | 298 | | |
Operating Segments [Member] | Financial Services | U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 4 | 0 | | |
Marketable securities | 1,354 | 1,169 | | |
Operating Segments [Member] | Financial Services | Non-U.S. government and agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 280 | 266 | | |
Marketable securities | 520 | 832 | | |
Operating Segments [Member] | Financial Services | Corporate debt | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 50 | 0 | | |
Marketable securities | 540 | 384 | | |
Operating Segments [Member] | Financial Services | Equities | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | Financial Services | Other marketable securities | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 42 | 40 | | |
Operating Segments [Member] | All Other [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Total cash and cash equivalents | 10 | 0 | | |
Operating Segments [Member] | All Other [Member] | Fair Value, Measurements, Recurring [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member] | Investment Type [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash, time deposits, and money market funds | 10 | 0 | | |
Operating Segments [Member] | All Other [Member] | U.S. government | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | U.S. government agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | Non-U.S. government and agencies | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | Corporate debt | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | Equities | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | 0 | 0 | | |
Operating Segments [Member] | All Other [Member] | Other marketable securities | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | | | |
Items measured at fair value [Line Items] | | | | |
Marketable securities | $ 0 | $ 0 | | |