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General and significant accounting policies (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jan. 01, 2021
General and significant accounting policies [Line Items]
Retained earnings	$ 49,467	$ 48,305
Accumulated other comprehensive income (loss) (AOCI)	$ (9,822)	(10,185)
Effect of Modified Retrospective Application Accounting Standards Update 2018-12
General and significant accounting policies [Line Items]
Retained earnings		29	$ 52
Accumulated other comprehensive income (loss) (AOCI)		$ 8	$ 1,800

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

Amount of accumulated undistributed earnings (deficit).