Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Marketable Securities.

Schedule of marketable securities

(Millions)	December 31, 2018		December 31, 2017
Corporate debt securities	$	—	$	14
Commercial paper		366		899
Certificates of deposit/time deposits		10		76
U.S. municipal securities		3		3
Asset-backed securities:
Automobile loan related		1		16
Credit card related		—		68
Asset-backed securities total		1		84
Current marketable securities	$	380	$	1,076
U.S. municipal securities	$	37	$	27
Non-current marketable securities	$	37	$	27
Total marketable securities	$	417	$	1,103

Marketable securities by contractual maturity

(Millions)	December 31, 2018
Due in one year or less	$	380
Due after one year through five years		13
Due after five years through ten years		15
Due after ten years		9
Total marketable securities	$	417