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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, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 428 $ 376
(Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 37 39
(Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 311 281
(Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 80 56
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7 10
Cash and cash equivalents | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7 10
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 109 105
Equity securities | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23 20
Equity securities | (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 86 85
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 176 155
Corporate debt securities | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3 2
Corporate debt securities | (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 173 153
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 136 106
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 52 43
Other | (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 80 $ 56