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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Unrealized gain (loss) on hedges of net investments $ (588) $ 12 $ (1,373) $ 363
Gain on amounts excluded from effectiveness testing 46 54 150 171
Derivative Contract [Member]        
Derivative [Line Items]        
Notional amount 24,100   24,100  
Derivative instruments, losses to be reclassified to earnings 12   $ 12  
Derivative Contract [Member] | Maximum [Member]        
Derivative [Line Items]        
Maximum length of time hedged in a cash flow hedge     21 months  
Derivative Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount 10,000   $ 10,000  
Gains (losses) on derivatives not designated as hedging instruments (79) 86 (105) 25
Derivative Contract [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Notional amount 5,800   5,800  
Derivative Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Notional amount 8,300   8,300  
Unrealized gain (loss) on hedges of net investments $ (402) $ 598 $ (276) $ 771