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v3.21.1

Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Anniversaries | Dec. 31, 2019 USD ($) Anniversaries | Dec. 31, 2018 USD ($) Anniversaries
Disclosure of significant accounting policies [line items] |  |  |
Share-based compensation | $ 29 | $ 32 | $ 35
Minimum equity interest for significant influence | 20.00% |  |
Number of customers | Anniversaries | 0 | 0 | 0
Revenues | $ 12,970 | $ 13,130 | $ 13,531
Increase decrease in financing obligations connected with leases | 213 | 274 | 296
Effect Of Adoption Of Accounting Standard On Retained Earnings | 6 |  |
Emission Rights [Member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Revenues | $ 0 | 0 | 0
Computer software [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Useful life of intangible asset | 5 years |  |
Extraction rights [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Useful life of intangible asset | 83 years |  |
Bottom of range [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Useful life of intangible asset | 3 years |  |
Top of range [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Useful life of intangible asset | 20 years |  |
Mobile equipment [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Carrying amount of assets acquired through capital lease | $ 213 | 274 | 296
Additional paid-in capital [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Share-based compensation | $ 29 | $ 17 | $ 34

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