Accrued and Other Liabilities Product Warranty and Related Liabilities (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Product Warranty and Related Liabilities [Roll Forward] | |||
| Warranty balance at beginning of period | $ 8,332 | $ 9,069 | $ 8,550 |
| Warranties issued and assumed in period – recall campaigns | 665 | 678 | 899 |
| Warranties issued and assumed in period – product warranty | 2,143 | 2,123 | 2,338 |
| Payments | (2,903) | (3,129) | (3,375) |
| Adjustments to pre-existing warranties | (464) | (495) | 636 |
| Effect of foreign currency and other | (183) | 86 | 21 |
| Warranty balance at end of period | $ 7,590 | $ 8,332 | $ 9,069 |