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Derivative contracts (Tables)
9 Months Ended
Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Derivative contracts outstanding The liabilities and related notional values of these contracts follows (in millions).

 

 

Liabilities

 

 

Notional

Value

 

September 30, 2019

 

$

1,236

 

 

$

23,042

 

December 31, 2018

 

 

2,452

 

 

 

26,759