Quarterly Results (Unaudited) Level 3 (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Three months ended
	March 31,				June 30,					September 30,				December 31,
	2015		2014		2015		2014			2015		2014		2015		2014
Revenues	$	4,617	$	4,612	$	4,685	$	4,616		$	4,562	$	4,769	$	4,513	$	4,617
Benefits, losses and expenses	3,992		4,003		4,215		4,466			4,183		4,273		4,009		4,173
Income from continuing operations, net of tax	467		466		413		150			372		388		421		345
Income (loss) from discontinued operations, net of tax	—		29		—		(617		)	9		—		—		37
Net income (loss)	467		495		413		(467		)	381		388		421		382
Basic earnings (losses) per common share	$	1.11	$	1.10	$	0.99	$	(1.04	)	$	0.92	$	0.89	$	1.03	$	0.89
Diluted earnings (losses) per common share	$	1.08	$	1.03	$	0.96	$	(1.00	)	$	0.90	$	0.86	$	1.01	$	0.86
Weighted average common shares outstanding, basic	422.6		449.8		418.7		450.6			413.8		437.2		406.9		429.6
Weighted average shares outstanding and dilutive potential common shares	433.7		478.6		428.1		467.9			423.0		450.8		415.9		442.6