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Retirement Plans (Schedule of Valuation of the Company's Pension Plan Assets by Pricing Categories) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 543	$ 522
(Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55	46
(Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	389	372
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	99	104
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	14
Cash and cash equivalents | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	14
Cash and cash equivalents | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147	131
Equity securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	23
Equity securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119	108
Equity securities | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	204	203
Corporate debt securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Corporate debt securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	202	201
Corporate debt securities | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	171	174
Other | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	7
Other | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	63
Other | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 99	$ 104

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+ References

No definition available.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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