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Preferred stock - Summary of Preferred Dividends Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Class of Stock [Line Items]
Preferred dividends paid	$ 106	$ 32	$ 72	$ 209	$ 169
Series A Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 1,344.8	$ 1,311.33	$ 1,577.81	$ 3,951.3	$ 4,718.27
Preferred dividends paid	$ 7	$ 7	$ 8	$ 21	$ 24
Series F Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 2,312.5	$ 0	$ 2,312.5	$ 4,625	$ 4,625
Preferred dividends paid	$ 23	$ 0	$ 23	$ 46	$ 46
Series G Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 2,350	$ 0	$ 2,350	$ 4,700	$ 4,700
Preferred dividends paid	$ 34	$ 0	$ 23	$ 58	$ 47
Preferred stock, redemption amount	$ 10			$ 10
Series H Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 925.00	$ 925.00	$ 925.00	$ 2,775	$ 2,775
Preferred dividends paid	$ 6	$ 5	$ 6	$ 16	$ 16
Series I Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 937.50	$ 937.50	$ 937.50	$ 2,812.5	$ 2,812.5
Preferred dividends paid	$ 12	$ 12	$ 12	$ 36	$ 36
Series J Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	1.00%			1.00%
Dividend paid per share (usd per share)	$ 3,325	$ 0		$ 3,325
Preferred dividends paid	$ 16	$ 0		$ 16
Series K Preferred Stock
Class of Stock [Line Items]
Depositary shares per share	0.03%			0.03%
Dividend paid per share (usd per share)	$ 1,537.5	$ 1,640		$ 3,177.5
Preferred dividends paid	$ 8	$ 8		$ 16

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