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Derivative Financial Instruments - Summary of Proprietary Trading Activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives     $ (230) $ (194)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ (184) $ (304) (233) (201)
Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives and Commodity Contracts 0 (1) (2) 2
Commodity Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Commodity Contracts 6 5 6 14
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (6) (5) (7) (11)
Unrealized Gain (Loss) on Derivatives 0 0 (1) 3
Foreign Exchange Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 (1) 0 1
Unrealized Gain (Loss) on Derivatives 0 (1) (1) (1)
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge $ 0 $ 0 $ (1) $ (2)