Insurance (Tables)

12 Months Ended

Dec. 31, 2019

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):

	2018		2019
Cash and cash equivalents	$	59	$	9
Marketable securities	649		697
Total cash, cash equivalents, and marketable securities	$	708	$	706

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):

	2017			2018			2019
Insurance losses	$	143		$	101		$	128
Loss adjustment expenses	8			5			7
Reinsurance income and other expenses, net	(27		)	(29		)	(32		)
Insurance expenses	$	124		$	77		$	103

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):

	2017						2018						2019
	Written			Earned			Written			Earned			Written			Earned
Direct	$	385		$	320		$	392		$	346		$	406		$	377
Assumed	—			—			—			—			—			—
Ceded	(227		)	(162		)	(225		)	(179		)	(223		)	(195		)
Net premiums	$	158		$	158		$	167		$	167		$	183		$	182