Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share

Schedule Of Earnings Per Share Basic And Diluted [Table Text Block]

The following table provides the calculation of earnings per share and the reconciliation of earnings per share and earnings per diluted share for the years ended December 31:
		2018			2017			2016
			Average	Per Share		Average	Per Share		Average	Per Share
($ in millions, except per share data)		Income	Shares	Amount	Income	Shares	Amount	Income	Shares	Amount
Earnings Per Share:
Net income available to common shareholders		2,118			2,105			1,472
Less: Income allocated to participating securities		23			23			15
Net income allocated to common shareholders	$	2,095	673	3.11	2,082	728	2.86	1,457	757	1.92
Earnings Per Diluted Share:
Net income available to common shareholders	$	2,118			2,105			1,472
Effect of dilutive securities:
Stock-based awards		-	12		-	13		-	7
Net income available to common shareholders		2,118			2,105			1,472
plus assumed conversions
Less: Income allocated to participating securities		23			23			15
Net income allocated to common shareholders
plus assumed conversions	$	2,095	685	3.06	2,082	741	2.81	1,457	764	1.91