Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Results (unaudited)

Quarterly Results

($ in millions, except per share data)	First Quarter				Second Quarter					Third Quarter				Fourth Quarter
	2012		2011		2012		2011			2012		2011		2012		2011
Revenues	$	8,362	$	8,095	$	8,278	$	8,081		$	8,128	$	8,242	$	8,547	$	8,236
Net income (loss)		766		524		423		(624	)		723		175		394		712
Net income (loss) earnings per share — Basic		1.54		0.99		0.86		(1.19	)		1.49		0.34		0.82		1.41
Net income (loss) earnings per share — Diluted		1.53		0.98		0.86		(1.19	)		1.48		0.34		0.81		1.40