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Other Assets - Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
MUMSS
Equity Method Investments
Income (loss) from investment in MUMSS	$ 34	$ 52	$ 100	$ 128

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