Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Total stockholder's equity at beginning of period at Dec. 31, 2020		$ 683	$ 2,211	$ 9,081	$ 803	$ (71)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(17)			15
Dividends to common stockholders ($2.40 and $1.13 per share)				(309)
Net income	$ 312			312
Other comprehensive loss	(616)				(616)
Purchase of treasury stock	(3)					(3)
Total stockholder's equity at end of period at Mar. 31, 2021	12,089	683	2,194	9,084	187	(59)
Total stockholder's equity at beginning of period at Dec. 31, 2021	12,809	683	2,215	9,663	320	(72)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(20)			16
Dividends to common stockholders ($2.40 and $1.13 per share)				(657)
Net income	313			313
Other comprehensive loss	(1,623)				(1,623)
Purchase of treasury stock	(21)					(21)
Total stockholder's equity at end of period at Mar. 31, 2022	$ 10,817	$ 683	$ 2,195	$ 9,319	$ (1,303)	$ (77)