Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results (unaudited)

Quarterly Results (unaudited)

($ in millions, except per share data)	First Quarter				Second Quarter				Third Quarter				Fourth Quarter
	2015		2014		2015		2014		2015		2014		2015		2014
Revenues	$	8,952	$	8,684	$	8,982	$	8,860	$	9,028	$	8,936	$	8,691	$	8,759
Net income applicable to common shareholders	648		587		326		614		621		750		460		795
Net income applicable to common shareholders earnings per common share - Basic	1.56		1.31		0.80		1.41		1.56		1.77		1.19		1.89
Net income applicable to common shareholders earnings per common share - Diluted	1.53		1.30		0.79		1.39		1.54		1.74		1.18		1.86