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	(12)					12
Share-based compensation			20
Other			3					1
Net Income (Loss)	$ (1,084)			(1,084)
Dividends declared				(220)
Other comprehensive loss	(774)					(774)
Shares acquired - share repurchase authorization								(196)
Shares acquired - share-based compensation plans								(8)
Ending Balance at Jun. 30, 2022	10,505	$ 397	1,367	11,331		(478)		(2,112)
Beginning Balance (in shares) at Dec. 31, 2021		160.3
Share-based awards (in shares)		0.5
Shares acquired - share repurchase authorization (in shares)		(1.6)
Ending Balance (in shares) at Jun. 30, 2022		159.2
Dividends declared per common share (in dollars per share)		$ 1.38
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 Mar. 31, 2022		$ 397	1,354	12,258		(138)		(1,959)
Share-based awards		0	2					3
Share-based compensation			9
Other			2					1
Net Income (Loss)	(818)			(818)
Dividends declared				(109)
Other comprehensive loss	(340)					(340)
Shares acquired - share repurchase authorization								(151)
Shares acquired - share-based compensation plans								(6)
Ending Balance at Jun. 30, 2022	10,505	$ 397	1,367	11,331		(478)		(2,112)
Beginning Balance (in shares) at Mar. 31, 2022		160.3
Share-based awards (in shares)		0.1
Shares acquired - share repurchase authorization (in shares)		(1.2)
Ending Balance (in shares) at Jun. 30, 2022		159.2
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	(6)					7
Share-based compensation			22
Other			2					1
Net Income (Loss)	759			759
Dividends declared				(235)
Other comprehensive loss	(12)					(12)
Shares acquired - share repurchase authorization								(67)
Shares acquired - share-based compensation plans								(3)
Ending Balance at Jun. 30, 2023	11,030	$ 397	1,410	12,235		(626)		(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)
Ending Balance (in shares) at Jun. 30, 2023		156.8
Dividends declared per common share (in dollars per share)		$ 1.50
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 Mar. 31, 2023		$ 397	1,398	11,818		(527)		(2,345)
Share-based awards		0	0					0
Share-based compensation			10
Other			2					1
Net Income (Loss)	534			534
Dividends declared				(117)
Other comprehensive loss	(99)					(99)
Shares acquired - share repurchase authorization								(42)
Shares acquired - share-based compensation plans								0
Ending Balance at Jun. 30, 2023	$ 11,030	$ 397	$ 1,410	$ 12,235		$ (626)		$ (2,386)
Beginning Balance (in shares) at Mar. 31, 2023		157.2
Share-based awards (in shares)		0.0
Shares acquired - share repurchase authorization (in shares)		(0.4)
Ending Balance (in shares) at Jun. 30, 2023		156.8
Dividends declared per common share (in dollars per share)		$ 0.75