Annual report pursuant to Section 13 and 15(d)

Derivatives - Derivatives Designated as Accounting Hedges - Fair Value Hedges (Details)

v3.3.1.900
Derivatives - Derivatives Designated as Accounting Hedges - Fair Value Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative $ (2,496) $ (82) $ (5,169)
Hedged Item 1,597 (827) 4,181
Hedge Ineffectiveness (899) (909) (988)
Interest rate risk on long-term debt | Interest expense      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (718) 2,144 (4,704)
Hedged Item (77) (2,935) 3,925
Hedge Ineffectiveness (795) (791) (779)
Interest rate and foreign currency risk on long-term debt | Interest expense      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (1,898) (2,212) (1,291)
Hedged Item 1,812 2,120 1,085
Hedge Ineffectiveness (86) (92) (206)
Interest rate risk on AFS securities | Interest income      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative 105 (35) 839
Hedged Item (127) 3 (840)
Hedge Ineffectiveness (22) (32) (1)
Price risk on commodity inventory | Trading gain (loss)      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative 15 21 (13)
Hedged Item (11) (15) 11
Hedge Ineffectiveness $ 4 $ 6 $ (2)