Insurance (Tables)

12 Months Ended

Dec. 31, 2016

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):

	2015		2016
Cash and cash equivalents	$	210	$	99
Marketable securities	369		475
Total cash, cash equivalents, and marketable securities	$	579	$	574

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):

	2014			2015			2016
Insurance losses	$	115		$	80		$	146
Loss adjustment expenses	6			5			5
Reinsurance income and other expenses, net	(14		)	(16		)	(26		)
Insurance expenses	$	107		$	69		$	125

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

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

	2014						2015						2016
	Written			Earned			Written			Earned			Written			Earned
Direct	$	293		$	230		$	328		$	254		$	371		$	298
Assumed	—			—			—			—			—			—
Ceded	(166		)	(105		)	(194		)	(121		)	(215		)	(142		)
Net premiums	$	127		$	125		$	134		$	133		$	156		$	156