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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 11,601.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.0
Total stockholders equity at Dec. 31, 2019	11,601.0	$ 1.0	$ 1,937.0	$ 7,952.0	$ (1,426.0)	$ 3,137.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	415.0			415.0
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	(12.0)
Other Comprehensive Income (Loss), Net of Tax	2,222.0					2,222.0
Dividends to stockholders, $3.06 per share	(182.0)			(182.0)
Treasury Stock, Value, Acquired, Cost Method	163.0				(163.0)
Reissuance of treasury stock	(10.0)		(12.0)	(25.0)	(27.0)
Proceeds from Issuance of Common Stock	481.0
Total stockholders equity at Dec. 31, 2020	14,352.0	1.0	2,406.0	8,148.0	(1,562.0)	5,359.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Noncontrolling Interest	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	14,352.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.0
Net Income (Loss) Attributable to Parent	617.0			617.0
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	0.0
Other Comprehensive Income (Loss), Net of Tax	(1,717.0)					(1,717.0)
Dividends to stockholders, $3.06 per share	(194.0)			(194.0)
Treasury Stock, Value, Acquired, Cost Method	99.0				(99.0)
Reissuance of treasury stock	(55.0)		(55.0)	(8.0)	(8.0)
Proceeds from Issuance of Common Stock	0.0
Total stockholders equity at Dec. 31, 2021	13,014.0	1.0	2,461.0	8,563.0	(1,653.0)	3,642.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Noncontrolling Interest	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	13,014.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.0
Net Income (Loss) Attributable to Parent	623.0			623.0
Stockholders' Equity, Other | Accounting Standards Update 2018-02 [Member]	0.0
Other Comprehensive Income (Loss), Net of Tax	(9,247.0)					(9,247.0)
Dividends to stockholders, $3.06 per share	(205.0)			(205.0)
Treasury Stock, Value, Acquired, Cost Method	81.0				(81.0)
Reissuance of treasury stock	(41.0)		(41.0)	(14.0)	(14.0)
Proceeds from Issuance of Common Stock	0.0
Total stockholders equity at Dec. 31, 2022	4,145.0	$ 1.0	$ 2,502.0	$ 8,967.0	$ (1,720.0)	$ (5,605.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	627.0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(4.0)
Net Income (Loss) Attributable to Noncontrolling Interest	4.0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	4.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,235.0
Stockholders' Equity Attributable to Noncontrolling Interest	$ 90.0