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Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS    
Accrued benefit liability—noncurrent $ (927) $ (1,342)
U.S. Defined Benefit Plans    
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS    
Noncurrent assets 0 0
Accrued benefit liability—current 0 0
Accrued benefit liability—noncurrent (151) (174)
Net amount recognized at end of year (151) (174)
Foreign Defined Benefit Plans    
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS    
Noncurrent assets 67 51
Accrued benefit liability—current (5) (4)
Accrued benefit liability—noncurrent (751) (1,138)
Net amount recognized at end of year $ (689) $ (1,091)