Supplemental financial information - Accrued expenses (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure Text Block Supplement [Abstract]
Accrued capital-related expenditures	$ 341	$ 191
Other	570	455
Total	$ 911	$ 646

Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481573/470-10-45-10

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