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Goodwill and Intangibles (Goodwill) (Narrative) (Details)
12 Months Ended
Nov. 30, 2019
USD ($)
Nov. 29, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Goodwill [Line Items]          
Goodwill, Impairment Loss $ 41,000,000 $ 1,156,000,000 $ 1,197,000,000    
Number of reporting units 6 12      
Goodwill     9,536,000,000 $ 2,245,000,000 $ 10,016,000,000
Reporting Unit, Zero or Negative Carrying Amount, Amount of Allocated Goodwill     $ 1    
Measurement Input, Discount Rate [Member] | Goodwill | Income Approach Valuation Technique | Minimum          
Goodwill [Line Items]          
Fair Value Inputs       9.00%  
Measurement Input, Discount Rate [Member] | Goodwill | Income Approach Valuation Technique | Maximum          
Goodwill [Line Items]          
Fair Value Inputs       10.00%