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Other Assets - Tax Equity Investments under the Proportional Amortization Method (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Equity Method Investments
Total proportional amortization method investment	$ 1,831	$ 1,854
Unfunded equity contributions	$ 639	613
Funding period	5 years
Excluded tax equity investments	$ 48	48
Low-income housing
Equity Method Investments
Total proportional amortization method investment	1,816	1,787
Renewable energy and other
Equity Method Investments
Total proportional amortization method investment	$ 15	$ 67

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