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Derivative contracts (Tables)
12 Months Ended
Dec. 31, 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

 

December 31, 2019

 

$

968

 

 

$

14,385

 

December 31, 2018

 

 

2,452

 

 

 

26,759