Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments [Abstract]

Amortized Cost and Fair Value of the Trust Investments

		Amortized Cost				Fair Value
	Longest	March 31,		December 31,		March 31,		December 31,
(in millions)	Maturity Dates	2022		2021		2022		2021
Stocks	—		*		*	$	1,879	$	1,972
Municipal bonds	2057	$	872	$	875		955		1,033
Government and agency securities	2067		1,023		1,095		1,092		1,212
Corporate bonds	2070		415		386		458		446
Short-term investments and receivables/payables1	One-year		134		199		143		207
Total		$	2,444	$	2,555	$	4,527	$	4,870

* Not applicable

1 Short-term investments include $11 million and $37 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by April 1, 2022 and January 3, 2022 as of March 31, 2022 and December 31, 2021, respectively.

Summary of gains and losses

	Three months ended March 31,
(in millions)	2022		2021
Gross realized gains	$	15	$	111
Gross realized losses		16		12
Net unrealized (losses) gains for equity securities		(100)		18