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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, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]    
Projected benefit obligation $ 4,000 $ 4,376
Accumulated benefit obligation 4,000 4,376
Fair value of plan assets $ 3,344 $ 3,592