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Fair Value Disclosures - Summary of Non-Pension Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 39 | $ 13
Liabilities | (17) | (18)
Fair Value Measurements on Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 39 | 13
Liabilities | (17) | (18)
Investment securities, including mutual funds | 8 | 11
Level 1 | Fair Value Measurements on Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Investment securities, including mutual funds | 8 | 10
Level 2 | Fair Value Measurements on Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 39 | 13
Liabilities | (17) | (18)
Investment securities, including mutual funds | 0 | 1
Level 3 | Fair Value Measurements on Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Investment securities, including mutual funds | $ 0 | $ 0

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