Derivative contracts (Tables)

3 Months Ended

Mar. 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
March 31, 2019	$	1,682	$	26,522
December 31, 2018		2,452		26,759