Leases - Summary of Future Lease Payments Under Non-Cancellable Leases (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2021	$ 25
2022	21
2023	13
2024	8
2025	3
Thereafter	2
Total future lease payments	72
Less imputed interest	(5)
Total lease liabilities	67
Finance Lease Liabilities, Payments, Due [Abstract]
2021	10
2022	10
2023	10
2024	10
2025	10
Thereafter	46
Total future lease payments	96
Less imputed interest	(20)
Total lease liabilities	$ 76