Income Taxes - Tax Credit and Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 62
Tax capital loss/credit carryforward	154	$ 131
Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	6,335	6,667
NOL carryforwards not subject to expiration	3,320
NOLs subject to expiration	3,015
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	2,412	$ 2,454
NOL carryforwards not subject to expiration	390
NOLs subject to expiration	$ 2,022