Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Open Market Repurchases [Member]	Common Stock [Member]	Treasury Stock [Member]	Treasury Stock [Member] Open Market Repurchases [Member]	Common Stock Shares Outstanding [Member]	Common Stock Shares Outstanding [Member] Open Market Repurchases [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total Stockholders' Equity [Member]	Total Stockholders' Equity [Member] Open Market Repurchases [Member]	Noncontrolling Interest [Member]
Beginning Balance, Value at Dec. 31, 2020	$ 2,447		$ 4	$ (3,854)				$ 3,226	$ (274)	$ 3,331	$ 2,433		$ 14
Beginning Balance, Shares at Dec. 31, 2020			453,778,975	(267,476,521)		186,302,454
Comprehensive income (loss):
Net income	370									370	370
Other comprehensive income (loss), net of tax	48								48		48
Total comprehensive income (loss)	418										418
Cash dividends:
Common stock	(29)									(29)	(29)
Dividend equivalent units related to employee stock-based compensation plans	(2)									(2)	(2)
Issuance of common shares	$ 19							19			19
Issuance of common shares, Shares	3,600,000		3,624,586			3,624,586
Stock-based compensation expense	$ 10							10			10
Common stock repurchased		$ (100)			$ (100)	$ (100)						$ (100)
Common stock repurchased, Shares					(8,178,100)	(8,200,000)	(8,178,100)
Shares repurchased related to employee stock-based compensation plans	$ (26)			$ (26)							(26)
Shares repurchased related to employee stock-based compensation plans, Shares	(2,200,000)			(2,235,658)		(2,235,658)
Ending Balance, Value at Mar. 31, 2021	$ 2,737		$ 4	$ (3,980)				3,255	(226)	3,670	2,723		14
Ending Balance, Shares at Mar. 31, 2021			457,403,561	(277,890,279)		179,513,282
Beginning Balance, Value at Dec. 31, 2021	2,608		$ 4	$ (4,495)				3,282	(133)	3,939	2,597		11
Beginning Balance, Shares at Dec. 31, 2021			458,629,384	(304,886,613)		153,742,771
Comprehensive income (loss):
Net income	255									255	255
Other comprehensive income (loss), net of tax	114								114		114
Total comprehensive income (loss)	369										369
Cash dividends:
Common stock	(24)									(24)	(24)
Dividend equivalent units related to employee stock-based compensation plans	(3)									(3)	(3)
Issuance of common shares	$ 11							11			11
Issuance of common shares, Shares	2,400,000		2,359,901			2,359,901
Stock-based compensation expense	$ 9							9			9
Common stock repurchased		$ (115)			$ (115)	$ (115)						$ (115)
Common stock repurchased, Shares					(6,247,437)	(6,200,000)	(6,247,437)
Shares repurchased related to employee stock-based compensation plans	$ (20)			$ (20)							(20)
Shares repurchased related to employee stock-based compensation plans, Shares	(1,100,000)			(1,110,584)		(1,110,584)
Noncontrolling Interest, Period Increase (Decrease)	$ (5)												(5)
Ending Balance, Value at Mar. 31, 2022	$ 2,830		$ 4	$ (4,630)				$ 3,302	$ (19)	$ 4,167	$ 2,824		$ 6
Ending Balance, Shares at Mar. 31, 2022			460,989,285	(312,244,634)		148,744,651