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Commitments - Summary of Contractual Obligations (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Detailed Information About Borrowings [Line Items] |  |
Future minimum lease payments | $ 1,323 |
Estimated annual benefit payment period | next 10 years | next 10 years
1-3 years [Member] |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |
Future minimum lease payments | $ 436 |
3-5 Years [Member] |  |
Disclosure of Detailed Information About Borrowings [Line Items] |  |
Future minimum lease payments | $ 242 |

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- Definition Benefits payments for next ten years. + References No definition available. + Details
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Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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