Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Property, Plant and Equipment [Line Items] | |||
| Depreciation expense | $ 508 | $ 497 | $ 460 |
| Provision for depreciation, percentage of aggregate average depreciable asset | 2.96% | 3.09% | 3.07% |
| Investment tax credit | $ 164 | ||
| Other Current Assets | |||
| Property, Plant and Equipment [Line Items] | |||
| Investment tax credit, receivable | 16 | ||
| Other Long-term Assets | |||
| Property, Plant and Equipment [Line Items] | |||
| Investment tax credit, receivable | $ 148 | ||