CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Shares ($1 par value)	Common Shares ($1 par value) Cumulative Effect, Period of Adoption, Adjustment	Paid-In Capital	Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Retained (Deficit) Earnings	Retained (Deficit) Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest	Noncontrolling Interest Cumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2019	$ (56)	$ (57)	$ 276	$ 276	$ 0	$ 0	$ (332)	$ (333)	$ (179)	$ (179)	$ 179	$ 179
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		(1)						(1)
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	514						530		(20)		4
Shares issued	11		1		10
Shares retired:
Repurchased	(602)		(14)		(28)		(560)
Surrendered (non-cash)	(13)						(13)
Cash dividends declared	(36)						(36)
Stock-based compensation	18				18
Balance at Mar. 31, 2020	(165)		263		0		(412)		(199)		183
Balance at Dec. 31, 2019	(56)	(57)	276	$ 276	0	$ 0	(332)	(333)	(179)	$ (179)	179	$ 179
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		$ (1)						$ (1)
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	766
Shares retired:
Noncontrolling Interest, Change in Redemption Value	0
Balance at Jun. 30, 2020	37		260		11		(223)		(184)		173
Balance at Mar. 31, 2020	(165)		263		0		(412)		(199)		183
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	252						224		15		13
Shares retired:
Repurchased	0		(3)		3
Cash dividends declared	(35)						(35)
Noncontrolling Interest, Change in Redemption Value	0
Stock-based compensation	8				8
Balance at Jun. 30, 2020	37		260		11		(223)		(184)		173
Shares retired:
Dividends paid to noncontrolling interest	$ (23)										(23)
Common share, par value (in dollars per share)	$ 1
Common share, par value (in dollars per share)	$ 1
Balance at Dec. 31, 2020	$ 421		258		0		79		(142)		226
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	90						94		(12)		8
Shares issued	0		1		(1)
Shares retired:
Repurchased	(303)		(6)		(27)		(270)
Surrendered (non-cash)	(13)						(13)
Noncontrolling Interest, Change in Redemption Value	(6)						(6)
Stock-based compensation	28				28
Balance at Mar. 31, 2021	217		253		0		(116)		(154)		234
Balance at Dec. 31, 2020	421		258		0		79		(142)		226
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	470
Shares retired:
Noncontrolling Interest, Change in Redemption Value	(6)
Balance at Jun. 30, 2021	60		247		0		(640)		239		214
Balance at Mar. 31, 2021	217		253		0		(116)		(154)		234
Increase (Decrease) in Stockholders' Equity
Total comprehensive income	380						(36)		393		23
Shares retired:
Repurchased	(447)		(6)		(12)		(429)
Cash dividends declared	(59)						(59)
Noncontrolling Interest, Change in Redemption Value	0
Stock-based compensation	12				12
Balance at Jun. 30, 2021	60		$ 247		$ 0		$ (640)		$ 239		214
Shares retired:
Dividends paid to noncontrolling interest	$ (43)										$ (43)
Common share, par value (in dollars per share)	$ 1