Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Retained Earnings As originally reported	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income As originally reported	Treasury Stock
Effect of ASU 2018-12 adoption on opening retained earnings				$ (10)
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						$ (352)
Beginning Balance at Dec. 31, 2021		$ 397	$ 1,356	12,635	$ 12,625	296	$ 648	$ (1,921)
Share-based awards		0	(11)					13
Share-based compensation			29
Other			5					1
Net Income (Loss)	$ (1,500)			(1,500)
Dividends declared				(329)
Other comprehensive loss	(1,084)					(1,084)
Shares acquired - share repurchase authorization								(399)
Shares acquired - share-based compensation plans								(8)
Ending Balance at Sep. 30, 2022	9,480	$ 397	1,379	10,806		(788)		(2,314)
Beginning Balance (in shares) at Dec. 31, 2021		160.3
Share-based awards (in shares)		0.5
Shares acquired - share repurchase authorization (in shares)		(3.7)
Stock Issued During Period, Shares, Other		0.0
Ending Balance (in shares) at Sep. 30, 2022		157.1
Dividends declared per common share (in dollars per share)		$ 2.07
Effect of ASU 2018-12 adoption on opening retained earnings				0
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						0
Beginning Balance at Jun. 30, 2022		$ 397	1,367	11,331	11,331	(478)	(478)	(2,112)
Share-based awards		0	1					1
Share-based compensation			9
Other			2					0
Net Income (Loss)	(416)			(416)
Dividends declared				(109)
Other comprehensive loss	(310)					(310)
Shares acquired - share repurchase authorization								(203)
Shares acquired - share-based compensation plans								0
Ending Balance at Sep. 30, 2022	9,480	$ 397	1,379	10,806		(788)		(2,314)
Beginning Balance (in shares) at Jun. 30, 2022		159.2
Share-based awards (in shares)		0.0
Shares acquired - share repurchase authorization (in shares)		(2.1)
Stock Issued During Period, Shares, Other		0.0
Ending Balance (in shares) at Sep. 30, 2022		157.1
Dividends declared per common share (in dollars per share)		$ 0.69
Effect of ASU 2018-12 adoption on opening retained earnings				0
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						0
Beginning Balance at Dec. 31, 2022	10,562	$ 397	1,392	11,711	11,711	(614)	(614)	(2,324)
Share-based awards		0	(5)					8
Share-based compensation			31
Other			4					2
Net Income (Loss)	660			660
Dividends declared				(353)
Other comprehensive loss	(213)					(213)
Shares acquired - share repurchase authorization								(67)
Shares acquired - share-based compensation plans								(5)
Ending Balance at Sep. 30, 2023	10,624	$ 397	1,422	12,018		(827)		(2,386)
Beginning Balance (in shares) at Dec. 31, 2022		157.1
Share-based awards (in shares)		0.3
Shares acquired - share repurchase authorization (in shares)		(0.6)
Stock Issued During Period, Shares, Other		0.1
Ending Balance (in shares) at Sep. 30, 2023		156.9
Dividends declared per common share (in dollars per share)		$ 2.25
Effect of ASU 2018-12 adoption on opening retained earnings				0
Effect of ASU 2018-12 adoption on opening accumulated other comprehensive income						0
Beginning Balance at Jun. 30, 2023		$ 397	1,410	12,235	$ 12,235	(626)	$ (626)	(2,386)
Share-based awards		0	1					1
Share-based compensation			9
Other			2					1
Net Income (Loss)	(99)			(99)
Dividends declared				(118)
Other comprehensive loss	(201)					(201)
Shares acquired - share repurchase authorization								0
Shares acquired - share-based compensation plans								(2)
Ending Balance at Sep. 30, 2023	$ 10,624	$ 397	$ 1,422	$ 12,018		$ (827)		$ (2,386)
Beginning Balance (in shares) at Jun. 30, 2023		156.8
Share-based awards (in shares)		0.0
Shares acquired - share repurchase authorization (in shares)		0.0
Stock Issued During Period, Shares, Other		0.1
Ending Balance (in shares) at Sep. 30, 2023		156.9
Dividends declared per common share (in dollars per share)		$ 0.75