Property and Equipment, net (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finance Lease, Right-of-Use, before Accumulated Amortization	$ 30,000,000	$ 25,000,000
Finance Lease, Right-of-Use Asset, Accumulated Amortization	16,000,000	13,000,000
Finance Lease, Right-of-Use Asset, Amortization	5,000,000	4,000,000	$ 4,000,000
Capitalized Computer Software, Accumulated Amortization	210,000,000	177,000,000
Capitalized Computer Software, Amortization	36,000,000	37,000,000	37,000,000
Capitalized Computer Software, Gross	338,000,000	279,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations
Physical held for sale assets	9,000,000	0
Facility exit costs | NextGen Program
Accelerated depreciation	13,000,000	36,000,000
Property, Plant and Equipment [Member]
Depreciation	$ 354,000,000	$ 390,000,000	$ 385,000,000