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Income Per Common Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator (basic and diluted):
Income from continuing operations	$ 210	$ 211	$ 343	$ 318
Less: Allocation to unvested restricted stock awards	2	2	3	2
Income from continuing operations attributable to common shareholders	208	209	340	316
Income from discontinued operations, net	14	29	411	38
Less: Allocation to unvested restricted stock awards	0	0	3	0
Income from discontinued operations, net attributable to common shareholders	14	29	408	38
Net income attributable to common shareholders	$ 222	$ 238	$ 748	$ 354
Denominator:
Basic common shares (based upon weighted average) (in shares)	262	289	267	291
Add: Stock option dilution (in shares)	1	1	1	1
Diluted common shares (in shares)	263	290	268	292

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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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