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Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 2,327 | $ 3,016
Percent of total assets | 100.00% | 100.00%
Growth-Oriented |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 1,434 | $ 1,812
Percent of total assets | 62.00% | 60.00%
Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 1,249 | $ 1,559
Percent of total assets | 54.00% | 52.00%
Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 144 | $ 204
Percent of total assets | 6.00% | 7.00%
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 41 | $ 49
Percent of total assets | 2.00% | 1.00%
Immunizing |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 893 | $ 1,204
Percent of total assets | 38.00% | 40.00%
Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 777 | $ 1,145
Percent of total assets | 33.00% | 38.00%
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 116 | $ 59
Percent of total assets | 5.00% | 2.00%

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