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Employee Benefits - Fair Value Measurements of Investments Held by Retirement Plan (Detail) $ in Millions | Dec. 31, 2022 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | $ 228 |
Common Stock | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 26 |
Money Market | Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 5 | [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 27 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 26 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market | Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 1 | [1]
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 201 |
Significant Other Observable Inputs (Level 2) | Money Market | Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 4 | [1]
Large-Cap Value | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 23 | [2]
Large-Cap Value | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 23 | [2]
Large-Cap Growth | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 17 | [3]
Large-Cap Growth | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 17 | [3]
Large-Cap Core | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 13 | [4]
Large-Cap Core | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 13 | [4]
United States Mid Cap Value | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 5 | [5]
United States Mid Cap Value | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 5 | [5]
Mid Cap Growth | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 4 | [6]
Mid Cap Growth | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 4 | [6]
Mid Cap Core | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 5 | [7]
Mid Cap Core | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 5 | [7]
US Small-Cap Value | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 3 | [8]
US Small-Cap Value | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 3 | [8]
Small Cap Value Growth | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 6 | [9]
Small Cap Value Growth | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 6 | [9]
Small-Cap Core | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 4 | [10]
Small-Cap Core | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 4 | [10]
International Equity | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 30 | [11]
International Equity | Significant Other Observable Inputs (Level 2) | Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 30 | [11]
U.S. Core | Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 65 | [12]
U.S. Core | Significant Other Observable Inputs (Level 2) | Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 65 | [12]
Intermediate Duration | Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | 22 | [13]
Intermediate Duration | Significant Other Observable Inputs (Level 2) | Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of assets | $ 22 | [13]
[1] | Includes cash equivalent investments in equity and fixed income strategies.
[2] | This category contains large-cap stocks with above-average yield. The portfolio typically holds between 60 and 70 stocks.
[3] | This category seeks long-term capital appreciation by investing primarily in large growth companies based in the U.S.
[4] | This fund tracks the performance of the S&P 500 Index by purchasing the securities represented in the Index in approximately the same weightings as the Index.
[5] | This category employs an indexing investment approach designed to track the performance of the CRSP US Mid-Cap Value Index.
[6] | This category employs an indexing investment approach designed to track the performance of the CRSP US Mid-Cap Growth Index.
[7] | This category seeks to track the performance of the S&P Midcap 400 Index.
[8] | This category consists of a selection of investments based on the Russell 2000 Value Index.
[9] | This category consists of a mutual fund invested in small cap growth companies along with a fund invested in a selection of investments based on the Russell 2000 Growth Index.
[10] | This category consists of a mutual fund investing in readily marketable securities of U.S. companies with market capitalizations within the smallest 10 percent of the market universe, or smaller than the 1000th largest US company.
[11] | This category invests primarily in medium to large non-US companies in developed and emerging markets. Under normal circumstances, at least 80 percent of total assets will be invested in equity securities, including common stocks, preferred stocks, and convertible securities.
[12] | This category currently includes equal investments in three mutual funds, two of which usually hold at least 80 percent of fund assets in investment grade fixed income securities, seeking to outperform the Barclays US Aggregate Bond Index while maintaining a similar duration to that index. The third fund targets investments of 50 percent or more in mortgage-backed securities guaranteed by the US government and its agencies.
[13] | This category consists of a mutual fund which invest in a diversified portfolio of high-quality bonds and other fixed income securities, including U.S. Government obligations, mortgage-related and asset backed securities, corporate and municipal bonds, CMOs, and other securities mostly rated A or better.

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