Restructuring Costs - Restructuring Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 47	$ 77	$ 43
Additions related to merger integration	0	12	52
Reductions related to severance payments	(34)	(42)	(18)
Balance at end of period	$ 13	$ 47	$ 77
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)