Marketable Securities and Held-to-Maturity Debt Securities (Tables)

12 Months Ended

Dec. 31, 2019

Marketable Securities and Held-to-Maturity Debt Securities

Schedule of marketable securities

(Millions)	December 31, 2019		December 31, 2018
Commercial paper	$	85	$	366
Certificates of deposit/time deposits		10		10
U.S. municipal securities		3		3
Asset-backed securities		—		1
Current marketable securities	$	98	$	380
U.S. municipal securities	$	43	$	37
Non-current marketable securities	$	43	$	37
Total marketable securities	$	141	$	417

Marketable securities by contractual maturity

(Millions)	December 31, 2019
Due in one year or less	$	98
Due after one year through five years		14
Due after five years through ten years		20
Due after ten years		9
Total marketable securities	$	141