Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Previously Reported	Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Previously Reported	Accumulated Other Comprehensive Loss Revision of Prior Period, Accounting Standards Update, Adjustment	Treasury Stock
Total stockholder's equity at beginning of period at Dec. 31, 2022		$ 683	$ 2,220	$ 9,336	$ 9,572	$ (236)	$ (3,598)	$ (3,557)	$ (41)	$ (93)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(7)							22
Dividends to common stockholders ($0.44, $0.42, $3.32 and $2.46 per share)				(671)
Net income	$ 838			838
Other comprehensive income (loss)	(143)						(143)
Purchase of treasury stock	(24)									(24)
Total stockholder's equity at end of period at Sep. 30, 2023	8,563	683	2,213	9,503			(3,741)			(95)
Total stockholder's equity at beginning of period at Jun. 30, 2023		683	2,204	9,359	9,359		(3,425)	(3,425)	0	(95)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			9							0
Dividends to common stockholders ($0.44, $0.42, $3.32 and $2.46 per share)				(114)
Net income	258			258
Other comprehensive income (loss)	(316)						(316)
Purchase of treasury stock										0
Total stockholder's equity at end of period at Sep. 30, 2023	8,563	683	2,213	9,503			(3,741)			(95)
Total stockholder's equity at beginning of period at Dec. 31, 2023	9,893	683	2,221	9,755	9,755	0	(2,672)	(2,672)	0	(94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			0							20
Dividends to common stockholders ($0.44, $0.42, $3.32 and $2.46 per share)				(908)
Net income	938			938
Other comprehensive income (loss)	835						835
Purchase of treasury stock	(20)									(20)
Total stockholder's equity at end of period at Sep. 30, 2024	10,758	683	2,221	9,785			(1,837)			(94)
Total stockholder's equity at beginning of period at Jun. 30, 2024		683	2,210	9,623	$ 9,623	$ 0	(2,547)	$ (2,547)	$ 0	(95)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			11							1
Dividends to common stockholders ($0.44, $0.42, $3.32 and $2.46 per share)				(121)
Net income	283			283
Other comprehensive income (loss)	710						710
Purchase of treasury stock										0
Total stockholder's equity at end of period at Sep. 30, 2024	$ 10,758	$ 683	$ 2,221	$ 9,785			$ (1,837)			$ (94)