Significant accounting policies and practices (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of effects of initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606

A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 follows (in millions).

	ASU 2016-01		ASU 2018-02		ASC 606		Total
Increase (decrease):
Assets	$	—	$	—	$	3,382	$	3,382
Liabilities		—		—		3,453		3,453
Accumulated other comprehensive income		(61,459)		84		—		(61,375)
Retained earnings		61,459		(84)		(70)		61,305
Shareholders’ equity		—		—		(70)		(70)