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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended								3 Months Ended		9 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jan. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Feb. 29, 2024	Jan. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Dividends paid to common shareholders											$ 2,812	$ 615
Cash dividends declared on common stock (in dollars per share)									$ 0.10	$ 0.10	$ 0.30	$ 0.30
Cash dividends paid on preferred stock (in dollars per share)							$ 15.688377
Dividends paid to preferred shareholders							$ 8				$ 0	$ 8
Common equities
Common share dividends									$ 59	$ 59	59	$ 59
O2024A
Cash dividends paid on common stock (in dollars per share)			$ 4.50
Dividends paid to common shareholders			$ 2,637
O2023A
Cash dividends paid on common stock (in dollars per share)								$ 0.75
Dividends paid to common shareholders								$ 439
O2025Q3
Cash dividends declared on common stock (in dollars per share)									$ 0.10
O2025Q3 | Common equities
Common share dividends									$ 59		$ 59
O2025Q2
Cash dividends paid on common stock (in dollars per share)	$ 0.10
Dividends paid to common shareholders	$ 58
O2025Q1
Cash dividends paid on common stock (in dollars per share)		$ 0.10
Dividends paid to common shareholders		$ 59
O2024Q4
Cash dividends paid on common stock (in dollars per share)			$ 0.10
Dividends paid to common shareholders			$ 58
O2024Q3
Cash dividends paid on common stock (in dollars per share)				$ 0.10
Dividends paid to common shareholders				$ 59
O2024Q2
Cash dividends paid on common stock (in dollars per share)					$ 0.10
Dividends paid to common shareholders					$ 58
O2024Q1
Cash dividends paid on common stock (in dollars per share)						$ 0.10
Dividends paid to common shareholders						$ 59
O2023Q4
Cash dividends paid on common stock (in dollars per share)								$ 0.10
Dividends paid to common shareholders								$ 59

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