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Pension and Other Postretirement Benefits (Schedule of Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligations $ 1,371 $ 1,499
Accumulated benefit obligations 1,327 1,445
Fair value of plan assets 1,012 1,220
Non-U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligations 363 247
Accumulated benefit obligations 329 223
Fair value of plan assets $ 167 $ 94