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Employee Retirement Plans (Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Employee Retirement Plans [Abstract] |  |
Projected benefit obligation | $ 3,754 | $ 3,843
Fair value of plan assets | $ 2,910 | $ 3,173

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