Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Retained Earnings Previously Reported	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Previously Reported	Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of ASU 2018-12 adoption on opening retained earnings				$ (12)
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						$ (434)
Beginning Balance at Dec. 31, 2020		$ 397	$ 1,328	10,073	$ 10,085	335	$ 769	$ (1,790)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards		0	(14)					18
Share-based compensation			33
Other			9					3
Net Income (Loss)	$ 2,968			2,968
Dividends declared				(406)
Other comprehensive income (loss)	(38)					(38)
Shares acquired - share repurchase authorization								(144)
Shares acquired - share-based compensation plans								(8)
Ending Balance at Dec. 31, 2021	12,764	$ 397	1,356	12,635	12,635	297	297	(1,921)
Beginning Balance (in shares) at Dec. 31, 2020		160,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)		600
Shares acquired—share repurchase authorization (in shares)		(1,200)
Shares acquired - share-based compensation plans (in shares)		(100)
Other (in shares)		100
Ending Balance (in shares) at Dec. 31, 2021		160,300
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of ASU 2018-12 adoption on opening retained earnings				0
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						0
Share-based awards		$ 0	(10)					14
Share-based compensation			37
Other			9					3
Net Income (Loss)	(487)			(487)
Dividends declared				(437)
Other comprehensive income (loss)	(911)					(911)
Shares acquired - share repurchase authorization								(410)
Shares acquired - share-based compensation plans								(10)
Ending Balance at Dec. 31, 2022	10,562	$ 397	1,392	11,711	$ 11,711	(614)	$ (614)	(2,324)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)		500
Shares acquired—share repurchase authorization (in shares)		(3,800)
Shares acquired - share-based compensation plans (in shares)		0
Other (in shares)		100
Ending Balance (in shares) at Dec. 31, 2022		157,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of ASU 2018-12 adoption on opening retained earnings				0
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						0
Share-based awards		$ 0	(3)					11
Share-based compensation			40
Other			8					3
Net Income (Loss)	1,843			1,843
Dividends declared				(470)
Other comprehensive income (loss)	179					179
Shares acquired - share repurchase authorization								(67)
Shares acquired - share-based compensation plans								(8)
Ending Balance at Dec. 31, 2023	$ 12,098	$ 397	$ 1,437	$ 13,084		$ (435)		$ (2,385)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)	280	400
Shares acquired—share repurchase authorization (in shares)		(600)
Shares acquired - share-based compensation plans (in shares)		0
Other (in shares)		100
Ending Balance (in shares) at Dec. 31, 2023		157,000