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Leases (Maturity) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating lease maturity
2020	$ 16
2021	12
2022	14
2023	12
2024	12
Thereafter	135
Total future minimum rental payment	201
Less amount representing imputed interest	(72)
Present value of future minimum rental payments under operating leases	129
Operating lease current portion, recorded in other current liabilities	$ (13)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Operating lease long-term lease liabilities, recorded in other long-term	$ 116
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Finance lease maturity
2020	$ 71
2021	71
2022	71
2023	71
2024	71
Thereafter	327
Total future minimum rental payment	682
Less amount representing imputed interest	(203)
Present value of future minimum rental payments under finance leases	479
Finance lease current portion, recorded in other current liabilities	$ (35)
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Finance lease long-term lease liabilities, recorded in other long-term liabilities	$ 444
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent

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