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Income Per Common Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator (basic and diluted):
Income from continuing operations	$ 133	$ 107
Less: Allocation to unvested restricted stock awards	1	1
Income from continuing operations attributable to common shareholders	132	106
Income from discontinued operations, net	397	9
Less: Allocation to unvested restricted stock awards	3	0
Income from discontinued operations, net attributable to common shareholders	394	9
Net income attributable to common shareholders	$ 526	$ 115
Denominator:
Basic common shares (based upon weighted average) (in shares)	273	293
Add: Stock option dilution (in shares)	1	1
Diluted common shares (in shares)	274	294

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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