Summary of Significant Accounting Policies - Schedule of Accrued Warranty Activity (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Standard Product Warranty Disclosure [Abstract] | ||||
| Accrued warranty—beginning of period | $ 1,130 | $ 844 | $ 1,089 | $ 748 |
| Warranty costs incurred | (62) | (61) | (143) | (115) |
| Net changes in liability for pre-existing warranties, including expirations and foreign exchange impact | 9 | 5 | 12 | 42 |
| Provision for warranty | 120 | 153 | 239 | 266 |
| Accrued warranty—end of period | $ 1,197 | $ 941 | $ 1,197 | $ 941 |