Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2020		$ 397	$ 1,328	$ 10,085	$ 769	$ (1,790)
Share-based awards		0	(14)			15
Share-based compensation			17
Other			3			1
Net Income (Loss)	$ 1,323			1,323
Dividends declared				(203)
Other comprehensive income (loss)	(38)				(38)
Shares acquired - share repurchase authorization						(28)
Shares acquired - share-based compensation plans						(7)
Ending Balance at Jun. 30, 2021	11,858	$ 397	1,334	11,205	731	(1,809)
Beginning Balance (in shares) at Dec. 31, 2020		160.9
Share-based awards (in shares)		0.5
Shares acquired - share repurchase authorization (in shares)		(0.3)
Ending Balance (in shares) at Jun. 30, 2021		161.1
Dividends declared per common share		$ 1.26
Beginning Balance at Mar. 31, 2021		$ 397	1,322	10,603	625	(1,809)
Share-based awards		0	2			3
Share-based compensation			8
Other			2			1
Net Income (Loss)	703			703
Dividends declared				(101)
Other comprehensive income (loss)	106				106
Shares acquired - share repurchase authorization						0
Shares acquired - share-based compensation plans						(4)
Ending Balance at Jun. 30, 2021	11,858	$ 397	1,334	11,205	731	(1,809)
Beginning Balance (in shares) at Mar. 31, 2021		161.0
Share-based awards (in shares)		0.1
Shares acquired - share repurchase authorization (in shares)		0.0
Ending Balance (in shares) at Jun. 30, 2021		161.1
Dividends declared per common share		$ 0.63
Beginning Balance at Dec. 31, 2021	13,105	$ 397	1,356	12,625	648	(1,921)
Share-based awards		0	(12)			12
Share-based compensation			20
Other			3			1
Net Income (Loss)	(1,081)			(1,081)
Dividends declared				(220)
Other comprehensive income (loss)	(1,071)				(1,071)
Shares acquired - share repurchase authorization						(196)
Shares acquired - share-based compensation plans						(8)
Ending Balance at Jun. 30, 2022	10,553	$ 397	1,367	11,324	(423)	(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		$ 1.38
Beginning Balance at Mar. 31, 2022		$ 397	1,354	12,241	59	(1,959)
Share-based awards		0	2			3
Share-based compensation			9
Other			2			1
Net Income (Loss)	(808)			(808)
Dividends declared				(109)
Other comprehensive income (loss)	(482)				(482)
Shares acquired - share repurchase authorization						(151)
Shares acquired - share-based compensation plans						(6)
Ending Balance at Jun. 30, 2022	$ 10,553	$ 397	$ 1,367	$ 11,324	$ (423)	$ (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		$ 0.69