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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash Flow Hedging [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (32) $ (103) $ (62) $ (143)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (223) (132) 87 (713)
Cash Flow Hedging [Member] | Commodity Contract [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (1) 2 (3) 2
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 17 4 17 4
Cash Flow Hedging [Member] | Foreign currency derivatives [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2) (5) (5) (13)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (19) (2) (20) (14)
Cash Flow Hedging [Member] | Cross currency derivatives [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (1) 2 (2) (15)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 1 3 3 (36)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]        
Derivative Instruments Gain Loss [Line Items]        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months (92)   (92)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (28) (102) (52) (117)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (222) (137) 87 (667)
Loss on Cash Flow Hedges due to impairment of assets $ (9) $ 0 $ (13) $ 0
Fair Value Hedging        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments in Hedges, at Fair Value, Net 3 3
Fair Value Hedging | Other Contract [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments in Hedges, at Fair Value, Net 35 35
Not Designated as Hedging Instrument [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) $ 10 $ (18) $ 20 $ 28
Not Designated as Hedging Instrument [Member] | Other Contract [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 12 0 (81) 6
Not Designated as Hedging Instrument [Member] | Foreign currency derivatives [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 7 (18) (4) 22
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) $ (9) $ 0 $ 105 $ 0
Designated as Hedging Instruments [Member] | Fair Value Hedging        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments in Hedges, at Fair Value, Net (32) (32)