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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 01, 2023	May 19, 2022	Jul. 19, 2021
July 2021 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount							$ 5,000
Number of shares repurchased				14,022,728
Cost of shares repurchased				$ 2,815
May 2022 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 2,500
Number of shares repurchased		3,676,528	8,634,600	14,022,728
Cost of shares repurchased		$ 685	$ 1,758	$ 2,815
Repurchase authorization remaining at end of period		$ 1,816		$ 1,816
July 2023 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 5,000
Number of shares repurchased	2,949,900		8,634,600
Cost of shares repurchased	$ 606		$ 1,758
Repurchase authorization remaining at end of period	$ 4,398		$ 4,398

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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