Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 11
Operating Lease, Weighted Average Discount Rate, Percent	5.00%
Short-term Lease, Cost	$ 31
Operating Lease, Cost	10
Operating lease assets	44	$ 0
Finance Lease, Right-of-Use Asset	1
Leases of Lessee Disclosure [Text Block]	45
Operating Lease, Liability, Current	8	0
Finance Lease, Liability, Current	0
Non-current operating lease liabilities	36	$ 0
Finance Lease, Liability, Noncurrent	1
Total lease liabilities	45
Finance Lease, Right-of-Use Asset, Amortization	0
Finance Lease, Interest Expense	0
Total lease costs	10
Operating Lease, Payments	9
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	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	3 years
Finance Lease, Liability, Payments, Remainder of Fiscal Year	$ 1
Lease, Liability, Payments, Remainder of Fiscal Year	12
Lessee, Operating Lease, Liability, Payments, Due Year Two	8
Finance Lease, Liability, Payments, Due Year Two	0
Lease, Liability, Payments, Due Year Two	8
Lessee, Operating Lease, Liability, Payments, Due Year Three	6
Finance Lease, Liability, Payments, Due Year Three	0
Lease, Liability, Payments, Due Year Three	6
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	29
Finance Lease, Liability, Payments, Due after Year Five	0
Lease, Liability, Payments, Due After Year Five	29
Lessee, Operating Lease, Liability, Payments, Due	59
Finance Lease, Liability, Payment, Due	1
Lease, Liability, Payments Due	60
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(15)
Finance Lease, Liability, Undiscounted Excess Amount	0
Lease, liability, undiscounted excess amount	(15)
Operating Lease, Liability	44
Finance Lease, Liability	$ 1