Short-Term and Long-Term Debt - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Maximum Available	$ 3,792
Non-operating indebtedness of subsidiaries to total capitalization, maximum	7.50%
Five-year revolving credit facility
Debt Instrument [Line Items]
Maximum Available	$ 2,000
Banking regulation, mortgage banking, net worth, minimum	$ 8,626
Percentage of aggregate net proceeds of equity issuances	50.00%
Debt to capital ratio (low end of range)	35.00%
Debt to capital ratio (high end of range)	100.00%