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			(3)			16
Dividends to common stockholders ($0.40, $0.38, $3.20, $1.89 per share)				(517)
Net income	$ 936			936
Other comprehensive loss	(457)				(457)
Purchase of treasury stock	(18)					(18)
Total stockholder's equity at end of period at Sep. 30, 2021	12,664	683	2,208	9,500	346	(73)
Total stockholder's equity at beginning of period at Jun. 30, 2021		683	2,201	9,348	509	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			7			0
Dividends to common stockholders ($0.40, $0.38, $3.20, $1.89 per share)				(104)
Net income	256			256
Other comprehensive loss	(163)				(163)
Purchase of treasury stock						0
Total stockholder's equity at end of period at Sep. 30, 2021	12,664	683	2,208	9,500	346	(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			(4)			17
Dividends to common stockholders ($0.40, $0.38, $3.20, $1.89 per share)				(876)
Net income	646			646
Other comprehensive loss	(4,459)				(4,459)
Purchase of treasury stock	(39)					(39)
Total stockholder's equity at end of period at Sep. 30, 2022	8,094	683	2,211	9,433	(4,139)	(94)
Total stockholder's equity at beginning of period at Jun. 30, 2022		683	2,203	9,415	(2,713)	(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			8			0
Dividends to common stockholders ($0.40, $0.38, $3.20, $1.89 per share)				(110)
Net income	128			128
Other comprehensive loss	(1,426)				(1,426)
Purchase of treasury stock						(18)
Total stockholder's equity at end of period at Sep. 30, 2022	$ 8,094	$ 683	$ 2,211	$ 9,433	$ (4,139)	$ (94)