Long-Term Debt - Narrative (Details) - USD ($)	Feb. 06, 2025	Jan. 07, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term finance leases and equipment financing			$ 67,000,000	$ 119,000,000
Finance lease liability			$ 79,000,000	$ 130,000,000
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]			Long-term debt	Long-term debt
State Street Bank
Debt Instrument [Line Items]
Long-term finance leases and equipment financing			$ 116,000,000	$ 187,000,000
Parent Company and Non-banking Subsidiaries | 4.857% Notes due 2034 | Fixed-to-floating rate senior notes
Debt Instrument [Line Items]
Interest rate on debt			4.857%
Parent Company and Non-banking Subsidiaries | 4.857% Notes due 2034 | Fixed-to-floating rate senior notes | Subsequent Event
Debt Instrument [Line Items]
Debt redeemed		$ 500,000,000
Interest rate on debt		4.857%
Parent Company and Non-banking Subsidiaries | 1.746% notes due 2026 | Fixed-to-floating rate senior notes
Debt Instrument [Line Items]
Interest rate on debt			1.746%
Parent Company and Non-banking Subsidiaries | 1.746% notes due 2026 | Fixed-to-floating rate senior notes | Subsequent Event
Debt Instrument [Line Items]
Debt redeemed	$ 300,000,000
Interest rate on debt	1.746%