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			(10)			16
Dividends to common stockholders ($0.40, $0.38, $2.80, $1.51 per share)				(413)
Net income	$ 680			680
Other comprehensive (loss) income	(294)				(294)
Purchase of treasury stock	(18)					(18)
Total stockholder's equity at end of period at Jun. 30, 2021	12,668	683	2,201	9,348	509	(73)
Total stockholder's equity at beginning of period at Mar. 31, 2021		683	2,194	9,084	187	(59)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			7			1
Dividends to common stockholders ($0.40, $0.38, $2.80, $1.51 per share)				(104)
Net income	368			368
Other comprehensive (loss) income	322				322
Purchase of treasury stock						(15)
Total stockholder's equity at end of period at Jun. 30, 2021	12,668	683	2,201	9,348	509	(73)
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			(12)			17
Dividends to common stockholders ($0.40, $0.38, $2.80, $1.51 per share)				(766)
Net income	518			518
Other comprehensive (loss) income	(3,033)				(3,033)
Purchase of treasury stock	(21)					(21)
Total stockholder's equity at end of period at Jun. 30, 2022	9,512	683	2,203	9,415	(2,713)	(76)
Total stockholder's equity at beginning of period at Mar. 31, 2022		683	2,195	9,319	(1,303)	(77)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			8			1
Dividends to common stockholders ($0.40, $0.38, $2.80, $1.51 per share)				(109)
Net income	205			205
Other comprehensive (loss) income	(1,410)				(1,410)
Purchase of treasury stock						0
Total stockholder's equity at end of period at Jun. 30, 2022	$ 9,512	$ 683	$ 2,203	$ 9,415	$ (2,713)	$ (76)