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Employee Benefit Plans (Summary of Amounts Recognized in the Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets $ 0 $ 0
Noncurrent liabilities (1,216) (1,285)
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0 0
Current liabilities (10) (10)
Noncurrent liabilities (597) (758)
Total recognized (607) (768)
Int’l.    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0 20
Current liabilities 0 0
Noncurrent liabilities (259) (190)
Total recognized (259) (170)
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities (10) (10)
Noncurrent liabilities (215) (209)
Total recognized $ (225) $ (219)