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Employee Benefit Plans - Plans with Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 233 $ 227
Accumulated benefit obligation 233 225
Fair value of plan assets 20 0
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 132 392
Accumulated benefit obligation 115 375
Fair value of plan assets $ 79 $ 313