Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

	Third Quarter				First Nine Months
	2020		2019		2020		2019
	($ in millions)
Stock-based compensation expense	$	13	$	10	$	25	$	46
Total tax benefit	10		3		39		34

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

During 2020, a committee of nonemployee members of our Board of Directors (and the Chief Executive Officer when delegated authority by such committee) granted stock options, restricted stock units (RSUs) and performance share units (PSUs) pursuant to the Long-Term Incentive Plan (LTIP), as follows:

	Third Quarter			First Nine Months
	Granted	Weighted-Average Grant-Date Fair Value		Granted	Weighted-Average Grant-Date Fair Value
Stock options	—	$	—	43,770	$	52.05
RSUs	10,230	211.90		177,770	210.13
PSUs	—	—		78,720	212.67

Schedule of Cash Proceeds Received from Share-based Payment Awards

	Third Quarter				First Nine Months
	2020		2019		2020		2019
	($ in millions)
Stock options exercised	313,358		55,155		998,996		677,072
Cash received upon exercise	$	27	$	3	$	82	$	47
Related tax benefit realized	8		1		24		16

Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

	Third Quarter				First Nine Months
	2020		2019		2020		2019
	($ in millions)
RSUs vested	1,635		142		203,934		166,197
Common Stock issued net of tax withholding	1,630		102		145,342		119,346
Related tax benefit realized	$	—	$	—	$	4	$	2

Performance Share Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

	First Nine Months
	2020		2019
	($ in millions)
PSUs earned	235,935		331,099
Common Stock issued net of tax withholding	156,450		221,241
Related tax benefit realized	$	7	$	9