Investments in equity securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of investments in equity securities

Investments in equity securities as of December 31, 2019 and 2018 are summarized based on the primary industry of the investee in the table below (in millions).

	Cost Basis		Net Unrealized Gains		Fair Value
December 31, 2019 *
Banks, insurance and finance	$	40,419	$	61,976	$	102,395
Consumer products		38,887		60,747		99,634
Commercial, industrial and other		31,034		14,964		45,998
	$	110,340	$	137,687	$	248,027

* Approximately 67% of the aggregate fair value was concentrated in five companies (American Express Company – $18.9 billion; Apple Inc. – $73.7 billion; Bank of America Corporation – $33.4 billion; The Coca-Cola Company – $22.1 billion and Wells Fargo & Company – $18.6 billion).

	Cost Basis		Net Unrealized Gains		Fair Value
December 31, 2018 *
Banks, insurance and finance	$	44,332	$	38,260	$	82,592
Consumer products		38,783		22,838		61,621
Commercial, industrial and other		19,752		8,792		28,544
	$	102,867	$	69,890	$	172,757

* Approximately 68% of the aggregate fair value was concentrated in five companies (American Express Company – $14.5 billion; Apple Inc. – $40.3 billion; Bank of America Corporation – $22.6 billion; The Coca-Cola Company – $18.9 billion and Wells Fargo & Company – $20.7 billion).