Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Basic and Diluted

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:

	2021				2020			2019
($ in millions, except per share data)	Income		Average Shares	Per Share Amount	Income	Average Shares	Per Share Amount	Income	Average Shares	Per Share Amount
Earnings Per Share:
Net income available to common     shareholders	$	2,659			1,323			2,419
Less: Income allocated to participating     securities	7				6			21
Net income allocated to common     shareholders	$	2,652	702	3.78	1,317	715	1.84	2,398	710	3.38
Earnings Per Diluted Share:
Net income available to common     shareholders	$	2,659			1,323			2,419
Effect of dilutive securities:
Stock-based awards	—		9		—	5		—	10
Net income available to common     shareholders plus assumed conversions	2,659				1,323			2,419
Less: Income allocated to participating     securities	7				6			21
Net income allocated to common     shareholders plus assumed conversions	$	2,652	711	3.73	1,317	720	1.83	2,398	720	3.33