Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Restricted Stock [Member] Common Stock [Member] Common Class A [Member]	Restricted Stock [Member] Common Stock [Member]	Restricted Stock [Member] Retained Earnings [Member]	Restricted Stock [Member] Treasury Stock [Member] Common Class A [Member]	Restricted Stock [Member] Treasury Stock [Member]	Restricted Stock [Member] AOCI Attributable to Parent [Member]	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member] Common Class A [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member] Treasury Stock [Member] Common Class A [Member]	Restricted Stock Units (RSUs) [Member] Treasury Stock [Member]	Restricted Stock Units (RSUs) [Member] AOCI Attributable to Parent [Member]	Restricted Stock Units (RSUs) [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member]	Retained Earnings [Member]	Treasury Stock [Member] Common Class A [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2019															8,768,959	101,746,860		(1,887,767)	(9,088,498)
Balance at Dec. 31, 2019															$ 31	$ 1,093	$ 504	$ (26)	$ (107)	$ (31)	$ 1,464
Net income															0	0	53	0	0	0	53
Preferred stock dividends															$ 0	$ 0	(13)	$ 0	$ 0	0	(13)
401(k) Plan (in shares)															0	430,899		0	0
401(k) Plan															$ 0	$ 4	0	$ 0	$ 0	0	4
2007 Long Term Incentive Plan stock options exercised (in shares)															0	274,746		0	(154,935)
2007 Long Term Incentive Plan stock options exercised															$ 0	$ 0	0	$ 0	$ (2)	0	(2)
Restricted stock awards (in shares)	166,814	248,543		0	(118,550)
Restricted stock awards	$ 0	$ 0	$ 0	$ 0	$ (2)	$ 0	$ (2)
Forfeiture of restricted stock awards (in shares)															0	(85,630)		0	0
Forfeiture of restricted stock awards															$ 0	$ 0	0	$ 0	$ 0	0	0
Repurchase of common stock (in shares)															0	0		0	(500,923)
Repurchase of common stock															$ 0	$ 0	0	$ 0	$ (6)	0	(6)
Stock-based compensation															$ 0	$ 4	0	$ 0	$ 0	0	4
Balance (in shares) at Mar. 31, 2020															8,935,773	102,615,418		(1,887,767)	(9,862,906)
Balance at Mar. 31, 2020															$ 31	$ 1,101	544	$ (26)	$ (117)	(31)	1,502
Balance (in shares) at Dec. 31, 2019															8,768,959	101,746,860		(1,887,767)	(9,088,498)
Balance at Dec. 31, 2019															$ 31	$ 1,093	504	$ (26)	$ (107)	(31)	1,464
Net income																					64
Balance (in shares) at Jun. 30, 2020															8,935,773	103,068,640		(1,887,767)	(13,328,021)
Balance at Jun. 30, 2020															$ 31	$ 1,104	542	$ (26)	$ (162)	(31)	1,458
Balance (in shares) at Mar. 31, 2020															8,935,773	102,615,418		(1,887,767)	(9,862,906)
Balance at Mar. 31, 2020															$ 31	$ 1,101	544	$ (26)	$ (117)	(31)	1,502
Net income															0	0	11	0	0	0	11
Preferred stock dividends															$ 0	$ 0	(13)	$ 0	$ 0	0	(13)
Restricted stock awards (in shares)	0	78,722		0	(17,296)
Restricted stock awards	$ 0	$ 0	0	$ 0	$ 0	0	0
Repurchase of common stock (in shares)															0	0		0	(3,335,255)
Repurchase of common stock															$ 0	$ 0	0	$ 0	$ (43)	0	(43)
Stock-based compensation															$ 0	$ 3	0	$ 0	$ 0	0	3
Vesting of restricted stock units (in shares)															0	374,500		0	(112,564)
Vesting of restricted stock units															$ 0	$ 0	0	$ 0	$ (2)	0	(2)
Balance (in shares) at Jun. 30, 2020															8,935,773	103,068,640		(1,887,767)	(13,328,021)
Balance at Jun. 30, 2020															$ 31	$ 1,104	542	$ (26)	$ (162)	(31)	1,458
Balance (in shares) at Dec. 31, 2020															8,935,773	103,100,856		(1,887,767)	(14,960,597)
Balance at Dec. 31, 2020															$ 34	$ 1,110	862	$ (26)	$ (188)	(39)	1,753
Net income															0	0	39	0	0	0	39
Preferred stock dividends															$ 0	$ 0	(13)	$ 0	$ 0	0	(13)
401(k) Plan (in shares)															0	390,389		0	0
401(k) Plan															$ 0	$ 7	0	$ 0	$ 0	0	7
Restricted stock awards (in shares)	233,425	296,042		(110,412)	(239,597)			0	60,050		0	(18,275)
Restricted stock awards	$ 0	$ 0	0	$ (2)	$ (4)	0	(6)	$ 0	$ 0	$ 0	$ 0	$ (1)	$ 0	$ (1)
Stock-based compensation															1	2	0	0	0	0	3
Common stock dividends															$ 0	$ 0	(8)	$ 0	$ 0	0	(8)
Balance (in shares) at Mar. 31, 2021															9,169,198	103,847,337		(1,998,179)	(15,218,469)
Balance at Mar. 31, 2021															$ 35	$ 1,119	880	$ (28)	$ (193)	(39)	1,774
Balance (in shares) at Dec. 31, 2020															8,935,773	103,100,856		(1,887,767)	(14,960,597)
Balance at Dec. 31, 2020															$ 34	$ 1,110	862	$ (26)	$ (188)	(39)	1,753
Net income																					78
Balance (in shares) at Jun. 30, 2021															9,169,198	103,898,352		(1,998,179)	(15,235,460)
Balance at Jun. 30, 2021															$ 36	$ 1,122	899	$ (28)	$ (193)	(39)	1,797
Balance (in shares) at Mar. 31, 2021															9,169,198	103,847,337		(1,998,179)	(15,218,469)
Balance at Mar. 31, 2021															$ 35	$ 1,119	880	$ (28)	$ (193)	(39)	1,774
Net income															0	0	39	0	0	0	39
Preferred stock dividends															0	0	(13)	0	0	0	(13)
401(k) Plan															0	0	0	0	0	0	0
Restricted stock awards (in shares)	0	47,360		0	(16,991)
Restricted stock awards	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Stock-based compensation															1	3	0	0	0	0	4
Common stock dividends															$ 0	$ 0	(7)	$ 0	$ 0	0	(7)
Balance (in shares) at Jun. 30, 2021															9,169,198	103,898,352		(1,998,179)	(15,235,460)
Balance at Jun. 30, 2021															$ 36	$ 1,122	$ 899	$ (28)	$ (193)	$ (39)	$ 1,797