Reinsurance (Tables)

12 Months Ended

Dec. 31, 2017

Reinsurance Disclosures [Abstract]

Property Casualty Insurance Premiums Written On Assumed And Ceded Business [Table Text Block]

The tables below summarize our consolidated property casualty insurance net written premiums, earned premiums and incurred loss and loss expenses:

(Dollars in millions)	Years ended December 31,
	2017			2016			2015
Direct written premiums	$	4,854		$	4,646		$	4,461
Assumed written premiums	125			103			77
Ceded written premiums	(139		)	(169		)	(177		)
Net written premiums	$	4,840		$	4,580		$	4,361

Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business

(Dollars in millions)	Years ended December 31,
	2017			2016			2015
Direct earned premiums	$	4,752		$	4,567		$	4,396
Assumed earned premiums	132			77			29
Ceded earned premiums	(162		)	(162		)	(154		)
Earned premiums	$	4,722		$	4,482		$	4,271

Incurred Consolidated Property Casualty Insurance Loss And Loss Expenses On Assumed And Ceded Business

(Dollars in millions)	Years ended December 31,
	2017		2016			2015
Direct incurred loss and loss expenses	$	2,961	$	2,874		$	2,596
Assumed incurred loss and loss expenses	113		43			12
Ceded incurred loss and loss expenses	64		(56		)	(36		)
Incurred loss and loss expenses	$	3,138	$	2,861		$	2,572

Earned Life Insurance Premiums On Ceded Business

consolidated life insurance earned premiums and contract holders' benefits incurred:

(Dollars in millions)	Years ended December 31,
	2017			2016			2015
Direct earned premiums	$	300		$	290		$	271
Ceded earned premiums	(68		)	(62		)	(62		)
Earned premiums	$	232		$	228		$	209

Life Insurance Contract Holders' Benefits Incurred On Ceded Business

(Dollars in millions)	Years ended December 31,
	2017			2016			2015
Direct contract holders' benefits incurred	$	319		$	303		$	292
Ceded contract holders' benefits incurred	(67		)	(57		)	(56		)
Contract holders' benefits incurred	$	252		$	246		$	236