Employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Combined Data for Domestic and Foreign Defined Benefit Pension and Post Retirement Healthcare Plans

The components of net periodic benefit (credit) cost are presented below. The service cost component is reflected in staff expense, whereas the remaining components are reflected in other expense.

Net periodic benefit (credit) cost	Quarter ended
	June 30, 2020									March 31, 2020									June 30, 2019
(in millions)	Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits
Service cost	$	—		$	3		$	—		$	—		$	3		$	—		$	—		$	3		$	—
Interest cost	39			6			1			39			7			1			45			8			1
Expected return on assets	(79		)	(9		)	(2		)	(80		)	(10		)	(1		)	(84		)	(12		)	(2		)
Other	21			3			—			22			3			(1		)	13			1			—
Net periodic benefit (credit) cost	$	(19	)	$	3		$	(1	)	$	(19	)	$	3		$	(1	)	$	(26	)	$	—		$	(1	)

Net periodic benefit (credit) cost	Year-to-date
	June 30, 2020									June 30, 2019
(in millions)	Domestic pension benefits			Foreign pension benefits			Health care benefits			Domestic pension benefits			Foreign pension benefits			Health care benefits
Service cost	$	—		$	6		$	—		$	—		$	6		$	—
Interest cost	78			13			2			89			16			3
Expected return on assets	(159		)	(19		)	(3		)	(168		)	(23		)	(4		)
Other	43			6			(1		)	26			1			(1		)
Net periodic benefit (credit) cost	$	(38	)	$	6		$	(2	)	$	(53	)	$	—		$	(2	)