Insurance (Tables)

12 Months Ended

Dec. 31, 2020

Insurance [Abstract]

Schedule of Insurance Assets [Table Text Block]

Cash, cash equivalents, and marketable securities related to insurance activities at December 31 were as follows (in millions):

	2019		2020
Cash and cash equivalents	$	9	$	22
Marketable securities	697		703
Total cash, cash equivalents, and marketable securities	$	706	$	725

Schedule of Insurance Underwriting Losses and Expenses [Table Text Block]

The components of insurance expenses for the years ended December 31 were as follows (in millions):

	2018		2019		2020
Insurance losses	$	101	$	128	$	110
Loss adjustment expenses	5		7		5
Reinsurance income and other expenses, net	(29)		(32)		(33)
Insurance expenses	$	77	$	103	$	82

Schedule of the Effect of Reinsurance Premiums Written and Earned [Table Text Block]

Insurance premiums written and earned for the years ended December 31 were as follows (in millions):

	2018				2019				2020
	Written		Earned		Written		Earned		Written		Earned
Direct	$	392	$	346	$	406	$	377	$	366	$	350
Assumed	—		—		—		—		—		—
Ceded	(225)		(179)		(223)		(195)		(229)		(207)
Net premiums	$	167	$	167	$	183	$	182	$	137	$	143