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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, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 522	$ 428
(Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46	37
(Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	372	311
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	104	80
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	7
Cash and cash equivalents | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	7
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	131	109
Equity securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23	23
Equity securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	108	86
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	203	176
Corporate debt securities | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	3
Corporate debt securities | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	201	173
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	174	136
Other | (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	4
Other | (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	52
Other | (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 104	$ 80

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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)
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