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Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 2,431 | $ 2,833
Percent of Total Assets | 100.00% | 100.00%
Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 1,698 | $ 2,060
Percent of Total Assets | 70.00% | 73.00%
Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 704 | $ 729
Percent of Total Assets | 29.00% | 26.00%
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount | $ 29 | $ 44
Percent of Total Assets | 1.00% | 1.00%

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