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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, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 376 $ 370
(Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 39 36
(Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 281 285
(Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 56 49
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 10 4
Cash and cash equivalents | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 10 4
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 105 120
Equity securities | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 20 28
Equity securities | (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 85 92
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 155 150
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 153 148
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 106 96
Other | (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7 2
Other | (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 43 45
Other | (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 56 $ 49