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Goodwill and Intangible Assets (Goodwill Rollforward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill Roll Forward    
Beginning Balance $ 6,577 $ 6,584
Foreign currency and other 20 (7)
Ending Balance 6,597 6,577
Goodwill, Impaired, Accumulated Impairment Loss    
Goodwill, accumulated impairments 700  
IS    
Goodwill Roll Forward    
Beginning Balance 275 282
Foreign currency and other 20 (7)
Ending Balance 295 275
Goodwill, Impaired, Accumulated Impairment Loss    
Goodwill, accumulated impairments 673  
WM    
Goodwill Roll Forward    
Beginning Balance 5,533 5,533
Foreign currency and other 0 0
Ending Balance 5,533 5,533
Goodwill, Impaired, Accumulated Impairment Loss    
Goodwill, accumulated impairments 0  
IM    
Goodwill Roll Forward    
Beginning Balance 769 769
Foreign currency and other 0 0
Ending Balance 769 $ 769
Goodwill, Impaired, Accumulated Impairment Loss    
Goodwill, accumulated impairments $ 27