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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flow Hedging [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (30) $ (40)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 310 (581)
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 (2) 0
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 (3) (8)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL (1) (12)
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) (17)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 2 (39)
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 (85)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (24) (15)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 309 (530)
Loss on Cash Flow Hedges due to impairment of assets (4) 0
Not Designated as Hedging Instrument [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (44) 46
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) (93) 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) (11) 40
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) $ 60 $ 0