Leases - Supplemental Balance Sheet Information (Details) $ in Millions |
Sep. 30, 2019
USD ($)
|
|---|---|
| Leases [Abstract] | |
| Operating lease right-of-use assets | $ 63 |
| Operating lease liabilities, current | (10) |
| Operating lease liabilities | (68) |
| Total operating lease liabilities | $ (78) |