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Employee Benefit Plans - Defined Benefit Pension Plans with an Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 4,498 | $ 4,000
Accumulated benefit obligation | 4,498 | 4,000
Fair value of plan assets | $ 3,914 | $ 3,344

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