Leases (Lease Income Associated with Operating Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Fixed payments	$ 15	$ 15	$ 67
Variable payments	44	67	131
Total lease income under operating leases	59	82	198
Operating revenues
Lessor, Lease, Description [Line Items]
Total lease income under operating leases	$ 59	$ 82	$ 103
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income, Regulated and Unregulated Operating Revenue	Other Nonoperating Income, Regulated and Unregulated Operating Revenue	Other Nonoperating Income, Regulated and Unregulated Operating Revenue
Other income
Lessor, Lease, Description [Line Items]
Total lease income under operating leases	$ 0	$ 0	$ 95
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income, Regulated and Unregulated Operating Revenue	Other Nonoperating Income, Regulated and Unregulated Operating Revenue	Other Nonoperating Income, Regulated and Unregulated Operating Revenue