Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

2016 Quarter Ended	Dec. 31			Sept. 30		June 30			March 31
(In millions, except per share data)
Total revenues	$	3,338		$	3,287	$	3,307			$   3,173
Net income (loss) (a)		290			327		(65	)		102
Per share-basic and diluted		0.86			0.97		(0.19	)		0.30
2015 Quarter Ended	Dec. 31			Sept. 30		June 30			March 31
(In millions, except per share data)
Total revenues	$	3,333		$	3,169	$	3,435			$   3,478
Net income (loss) (b)		(201	)		182		170			109
Per share-basic and diluted		(0.58	)		0.50		0.46			0.29

The sum of the quarterly per share amounts may not equal per share amounts reported for year-to-date periods. This is due to changes in the number of weighted average shares outstanding and the effects of rounding for each period.

(a) Net loss for the second quarter of 2016 includes the impact of a $267 million asset impairment charge at Diamond Offshore.

(b) Net loss for the fourth quarter of 2015 includes the impact of a $177 million charge related to recognition of a premium deficiency in CNA’s long term care business and a $182 million asset impairment charge at Diamond Offshore.