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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]        
Unrealized gain (loss) on hedges of net investments $ 797 $ 65 $ (785) $ 351
Gain on amounts excluded from effectiveness testing 48 61 104 117
Derivative Contract [Member]        
Derivative [Line Items]        
Notional amount 22,900   22,900  
Derivative instruments, gains to be reclassified to earnings 15   $ 15  
Derivative Contract [Member] | Maximum [Member]        
Derivative [Line Items]        
Maximum length of time hedged in a cash flow hedge     18 months  
Derivative Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount 8,700   $ 8,700  
Gain on derivatives not designated as hedging instruments (82) (54) (26) (61)
Derivative Contract [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Notional amount 6,100   6,100  
Derivative Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Notional amount 8,100   8,100  
Unrealized gain (loss) on hedges of net investments $ (188) $ (118) $ 126 $ 173