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Derivative Financial Instruments - Summary of Proprietary Trading Activities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives     $ (149) $ (100)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 73 $ 88 (161) (113)
Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Derivatives and Commodity Contracts 5 (1) 3 1
Commodity Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Unrealized Gain (Loss) on Commodity Contracts 11 4 17 18
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (6) (6) (13) (17)
Unrealized Gain (Loss) on Derivatives 5 (2) 4 1
Foreign Exchange Contract [Member] | Operating Revenue [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1 1 1 2
Unrealized Gain (Loss) on Derivatives 0 1 (1) 0
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge $ (1) $ 0 $ (2) $ (2)