Employee Benefit Plans and Other Postretirement Benefits - Schedule of Pension Plan Asset Investments and Target Allocations (Details)	Jan. 05, 2018	Dec. 31, 2017	Dec. 31, 2016
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value		21.00%	54.00%
Fixed Income Securities | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	52.00%
International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value		6.00%	23.00%
International Equity Securities | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	28.00%
U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value		9.00%	21.00%
U.S. Equity Securities | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	20.00%
Real Estate Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value			1.00%
Other Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value		64.00%	1.00%