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Employee Benefit Plans - Change in Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
United States Pension Plan of US Entity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 1,722 $ 1,726 $ 1,884
Actual return on plan assets 109 (48)  
Company contributions 0 0  
Benefits paid (113) (110)  
Currency translation adjustments 0 0  
Plan participant contributions 0 0  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0 0
Foreign Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 978 1,009 2,325
Actual return on plan assets 136 38  
Company contributions 31 33  
Benefits paid (75) (1,364)  
Currency translation adjustments (124) (25)  
Plan participant contributions 1 2  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 (427) 1
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,700 2,735 4,209
Actual return on plan assets 245 (10)  
Company contributions 31 33  
Benefits paid (188) (1,474)  
Currency translation adjustments (124) (25)  
Plan participant contributions 1 2  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ 0 $ (427) $ 1