Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Debt Securities, Available-for-sale [Abstract]

Schedule of marketable securities

The following is a summary of amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current).

(Millions)	2021		2020
Corporate debt securities	$	—	$	7
Commercial paper	109		237
Certificates of deposit/time deposits	14		31
U.S. treasury securities	75		125
U.S. municipal securities	3		4
Current marketable securities	$	201	$	404
U.S. municipal securities	$	27	$	30
Non-current marketable securities	$	27	$	30
Total marketable securities	$	228	$	434

Schedule of marketable securities by contractual maturity

The balance at December 31, 2021, for marketable securities by contractual maturity are shown below. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

(Millions)	2021
Due in one year or less	$	201
Due after one year through five years	15
Due after five years through ten years	12
Total marketable securities	$	228