Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Oct. 15, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income from continuing operations		$ 258	$ 211	$ 126
Less: preferred stock dividends declared		2	2	2
Net income from continuing operations attributable to common shareholders		256	209	124
Income from discontinued operations		0	50	344
Net income attributable to common shareholders - basic		256	259	468
Add: interest expense related to convertible notes		0	0	9
Net income attributable to common shareholders - diluted		$ 256	$ 259	$ 477
Average shares outstanding - basic (in shares)		430	435	446
Effect of dilutive securities:
Stock options (in shares)		0	0	1
Stock and performance awards (in shares)		5	4	5
Convertible notes (in shares)		0	0	11
Average shares outstanding - diluted (in shares)		435	439	463
Convertible notes
Effect of dilutive securities:
Number of anti-dilutive securities (in shares)	15