Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Company retirement benefit plans	$ 38	$ 26
Revaluation of derivative financial instruments to fair value	2	0
Tax losses, credits and interest deduction carryforwards	1,052	855
Share-based compensation	41	31
Accrued expenses	420	350
Lease liabilities	292	263
Total deferred tax assets	1,845	1,525
Less: valuation allowances	(914)	(737)	$ (578)	$ (507)
Total deferred tax assets after valuation allowances	931	788
Deferred tax liabilities:
Investment in subsidiaries	155	159
Depreciation, depletion and amortization	3,109	3,165
Leased right-of-use assets	274	250
Rolled-over capital gains	21	20
Other	12	0
Total deferred tax liabilities	3,571	3,594
Total net deferred tax liabilities	$ 2,640	$ 2,806