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Employee Benefit Plans (Schedule of Projected Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Defined Benefit Plan, Benefit Obligation | $ 254 | $ 220
Defined Benefit Plan, Plan Assets, Amount | $ 157 | $ 133

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