Leases (Lease Income Associated with Operating Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Fixed payments	$ 15	$ 67	$ 57
Variable payments	67	131	124
Total lease income under operating leases	$ 82	$ 198	$ 181
Operating Revenues
Lessor, Lease, Description [Line Items]
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
Total lease income under operating leases	$ 82	$ 103	$ 99
Other Income
Lessor, Lease, Description [Line Items]
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
Total lease income under operating leases	$ 0	$ 95	$ 82