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Fair Value Disclosures - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Measurements, Nonrecurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Indefinite-lived intangibles | $ 135 | $ 796 | $ 1,365

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- Definition Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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