Leases Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating lease right-of-use asset (Note 25)	$ 383	$ 380
Operating lease liabilities (Note 25)	92	100
Long-term operating lease liabilities (Note 25)	304	300
Operating Lease, Liability	396	400
Property, Gross	7,013	6,611
Accumulated depreciation	(3,719)	(3,310)
Finance Lease, Right-of-Use Asset	11	18
Finance Lease, Liability, Current	3	4
Finance Lease, Liability, Noncurrent	10	14
Finance Lease, Liability	$ 13	$ 18
Operating Lease, Weighted Average Remaining Lease Term	6 years	6 years
Finance Lease, Weighted Average Remaining Lease Term	5 years	6 years
Operating Lease, Weighted Average Discount Rate, Percent	3.00%	3.25%
Finance Lease, Weighted Average Discount Rate, Percent	3.50%	3.50%
Capital Lease Obligations [Member]
Property, Gross	$ 26	$ 31
Accumulated depreciation	$ (15)	$ (13)