CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Treasury Stock Member	Accumulated Other Comprehensive Income Member
Total stockholders equity at Dec. 31, 2018	$ 8,450	$ 1	$ 1,899	$ 7,285	$ (1,371)	$ 636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	870			870
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	0
Other Comprehensive Income (Loss), Net of Tax	2,501					2,501
Dividends to stockholders, $2.86 per share	(163)			(163)
Treasury Stock, Value, Acquired, Cost Method	101				(101)
Reissuance of treasury stock	(44)		(38)	(40)	(46)
Proceeds from Issuance of Common Stock	0
Total stockholders equity at Dec. 31, 2019	11,601	1	1,937	7,952	(1,426)	3,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	415			415
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	(12)			(12)
Other Comprehensive Income (Loss), Net of Tax	2,222					2,222
Dividends to stockholders, $2.86 per share	(182)			(182)
Treasury Stock, Value, Acquired, Cost Method	163				(163)
Reissuance of treasury stock	(10)		(12)	(25)	(27)
Proceeds from Issuance of Common Stock	481		481
Total stockholders equity at Dec. 31, 2020	14,352	1	2,406	8,148	(1,562)	5,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	617			617
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	0
Other Comprehensive Income (Loss), Net of Tax	(1,717)					(1,717)
Dividends to stockholders, $2.86 per share	(194)			(194)
Treasury Stock, Value, Acquired, Cost Method	99				(99)
Reissuance of treasury stock	(55)		(55)	(8)	(8)
Proceeds from Issuance of Common Stock	0
Total stockholders equity at Dec. 31, 2021	$ 13,014	$ 1	$ 2,461	$ 8,563	$ (1,653)	$ 3,642