Schedule of Stockholders Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Common Stock, Shares, Outstanding beginning of period			89,537,331				89,537,331
Issuance of shares pursuant to equity-based plans	$ 0	$ 1	$ 0	$ 0	$ 1	$ 0
Stockholders' Equity	2,661	2,675	2,613	2,646	2,638	2,591	$ 2,613	$ 2,591
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1					1
Dividends declared	(39)	(39)	(36)	(36)	(35)	(35)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 50	32	96	(17)	39	81	$ 178	103
Common Stock, Shares, Outstanding end of period	89,409,012						89,409,012
Stockholders' Equity	$ 2,675	$ 2,661	$ 2,675	$ 2,595	$ 2,646	$ 2,638	$ 2,675	$ 2,595
Common Stock, Dividends, Per Share, Declared	$ 0.4300	$ 0.4300	$ 0.4075	$ 0.4075	$ 0.3850	$ 0.3850
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	$ 2	$ 4	$ 2	$ 2	$ 3
Other		$ (12)					$ (12)
Common Stock [Member]
Common Stock, Shares, Outstanding beginning of period	89,401,722	89,576,748	89,537,331	89,506,951	89,464,521	89,387,124	89,537,331	89,387,124
Issuances of shares pursuant to equity-based plans	7,290	74,974	39,417	2,832	42,430	77,397
Common Stock, Shares, Outstanding end of period	89,409,012	89,401,722	89,576,748	89,509,783	89,506,951	89,464,521	89,409,012	89,509,783
Common Stock Including Additional Paid in Capital [Member]
Issuance of shares pursuant to equity-based plans	$ 0	$ 1	$ 0	$ 0	$ 1	$ 0
Stockholders' Equity	1,235	1,233	1,231	1,224	1,220	1,220	$ 1,231	$ 1,220
Dividends declared	0	0	0	0	0	0
Stockholders' Equity	1,237	1,235	1,233	1,226	1,224	1,220	1,237	1,226
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	2	4	2	2	3
Other		(3)
AOCI Attributable to Parent [Member]
Stockholders' Equity	(11)	(11)	(11)	(9)	(9)	(10)	(11)	(10)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1			0		1
Dividends declared	0	0	0	0	0	0
Stockholders' Equity	(10)	(11)	(11)	(9)	(9)	(9)	(10)	(9)
Other		0
Retained Earnings [Member]
Stockholders' Equity	1,437	1,453	1,393	1,431	1,427	1,381	1,393	1,381
Dividends declared	39	39	36	36	35	35
Stockholders' Equity	$ 1,448	1,437	$ 1,453	$ 1,378	$ 1,431	$ 1,427	$ 1,448	$ 1,378
Other		$ (9)