Guarantees (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Product Warranty Liability [Line Items] | ||
| Balance as of January 1 | $ 1,199 | $ 1,212 |
| Warranties and performance guarantees issued | 221 | 218 |
| Settlements made | 194 | 192 |
| Other | 21 | 0 |
| Balance as of September 30 | $ 1,247 | $ 1,238 |