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v3.20.4

Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 9 |
Operating Lease, Weighted Average Discount Rate, Percent | 5.00% |
Short-term Lease, Cost | $ 2 |
Operating Lease, Cost | 12 | $ 10
Operating lease assets | 40 | 44
Finance Lease, Right-of-Use Asset | 0 | 1
Leases of Lessee Disclosure [Text Block] | 40 | 45
Operating Lease, Liability, Current | 8 | 8
Finance Lease, Liability, Current | 0 | 0
Non-current operating lease liabilities | 32 | 36
Finance Lease, Liability, Noncurrent | 0 | 1
Total lease liabilities | 40 | 45
Finance Lease, Right-of-Use Asset, Amortization | 0 | 0
Finance Lease, Interest Expense | 0 | 0
Total lease costs | 12 | 10
Operating Lease, Payments | 9 | 9
Variable Lease, Cost |  | 31
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 4 | 47
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability |  | $ 1
Finance Lease, Weighted Average Discount Rate, Percent | 4.00% |
Operating Lease, Weighted Average Remaining Lease Term | 12 years |
Finance Lease, Weighted Average Remaining Lease Term | 2 years |
Finance Lease, Liability, Payments, Remainder of Fiscal Year | $ 0 |
Lease, Liability, Payments, Remainder of Fiscal Year | 9 |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 7 |
Finance Lease, Liability, Payments, Due Year Two | 0 |
Lease, Liability, Payments, Due Year Two | 7 |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 4 |
Finance Lease, Liability, Payments, Due Year Three | 0 |
Lease, Liability, Payments, Due Year Three | 4 |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 3 |
Finance Lease, Liability, Payments, Due Year Four | 0 |
Lease, Liability, Payments, Due Year Four | 3 |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 2 |
Finance Lease, Liability, Payments, Due Year Five | 0 |
Lease, Liability, Payments, Due Year Five | 2 |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 27 |
Finance Lease, Liability, Payments, Due after Year Five | 0 |
Lease, Liability, Payments, Due After Year Five | 27 |
Lessee, Operating Lease, Liability, Payments, Due | 52 |
Finance Lease, Liability, Payment, Due | 0 |
Lease, Liability, Payments Due | 52 |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (12) |
Finance Lease, Liability, Undiscounted Excess Amount | 0 |
Lease, liability, undiscounted excess amount | (12) |
Operating Lease, Liability | 40 |
Finance Lease, Liability | $ 0 |
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