Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2025		Jun. 30, 2024	Jun. 30, 2025		Jun. 30, 2024	Jul. 01, 2025	Jul. 01, 2023
Equity, Class of Treasury Stock [Line Items]
Share Repurchase Authorization, Expired	$ 628			$ 628
July 2023 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount								$ 5,000
Number of shares repurchased	2,339,727		2,254,236	3,685,509		3,474,357
Cost of shares repurchased	$ 676		$ 570	$ 1,061		$ 886
Repurchase authorization remaining at end of period (1)	$ 0	[1]	$ 2,808	$ 0	[1]	$ 2,808
July 2025 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount							$ 5,000

[1] As of June 30, 2025, $628 million expired under the July 2023 $5.0 billion share repurchase authorization.