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Goodwill And Other Intangibles (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Accumulated goodwill impairment charges $ 2,788       $ 2,788 $ 40
EBITDA multiplier 5.5 5.8 5.8 5.8    
Estimated future amortization expense, year 1 $ 569       569  
Estimated future amortization expense, year 2 454       454  
Estimated future amortization expense, year 3 354       354  
Estimated future amortization expense, year 4 260       260  
Estimated future amortization expense, year 5 $ 173       $ 173  
Minimum [Member]            
Finite-Lived Intangible Assets [Line Items]            
EBITDA multiplier         4.4  
Estimated useful life         8 years  
Maximum [Member]            
Finite-Lived Intangible Assets [Line Items]            
EBITDA multiplier         6.5  
Estimated useful life         12 years  
Customer Base [Member]            
Finite-Lived Intangible Assets [Line Items]            
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension         6 years  
Royalty Agreement [Member]            
Finite-Lived Intangible Assets [Line Items]            
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension         3 years