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Pension and Postretirement Benefit Plans - Additional Information (Details) - Pension Plan [Member] - UNITED STATES
$ in Millions
Dec. 31, 2017
USD ($)
plan
Defined Benefit Plan Disclosure [Line Items]  
Number Of Plans Terminated | plan 1
Terminated Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Benefit Obligation $ 1,064
Defined Benefit Plan, Fair Value of Plan Assets 900
Defined Benefit Plan, AOCI Losses $ 369