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Significant business acquisitions - Summary of preliminary values of identified assets acquired and liabilities assumed (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | [1] | Dec. 31, 2023 | [1] | Jan. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Assets acquired |  |  |  |  |
Goodwill |  | $ 84,549 | $ 84,626 |  | $ 78,119
Pilot Travel Centers LLC [Member] |  |  |  |  |
Assets acquired |  |  |  |  |
Property, plant and equipment |  |  |  | $ 8,015 |
Goodwill | [2] |  |  | 6,605 |
Other intangible assets |  |  |  | 6,853 |
Other assets |  |  |  | 7,047 |
Assets acquired |  |  |  | 28,520 |
Net assets |  |  |  | 14,365 |
Liabilities assumed and noncontrolling interests |  |  |  |  |
Notes payable |  |  |  | 5,876 |
Other liabilities |  |  |  | 4,918 |
Liabilities assumed |  |  |  | 10,794 |
Noncontrolling interests, predominantly redeemable |  |  |  | 3,361 |
Liabilities assumed and noncontrolling interests |  |  |  | $ 14,155 |
[1] | Net of accumulated goodwill impairm ents of $11.1 billion as of March 31, 2024 and Decem ber 31, 2023.
[2] | Goodwill from this acquisition is expected to be deductible for income tax purposes.

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