Leases - ROU Assets and Lease Liabilities (Details) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Lessee, Lease, Description [Line Items] | ||
| Lease liabilities | $ 296 | $ 204 |
| Property, plant and equipment | ||
| Lessee, Lease, Description [Line Items] | ||
| ROU assets | 282 | 187 |
| Short-term debt | ||
| Lessee, Lease, Description [Line Items] | ||
| Lease liabilities | 97 | 52 |
| Long-term debt | ||
| Lessee, Lease, Description [Line Items] | ||
| Lease liabilities | $ 199 | $ 151 |