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Investments (Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
May 31, 2016
Other investments $ 69 $ 67  
Investment assets 348 336  
Investment liabilities 198 241  
Dow Corning Corporation [Member]      
Ownership interest     50.00%
All Other [Member]      
Investment in affiliated companies, at equity $ 279 269  
HSG [Member]      
Ownership interest 50.00%    
Investment liabilities $ 198 $ 241  
HSG [Member]      
Investment in affiliated companies, at equity     $ 4,800
HSG [Member] | HSC Operating Partnership [Member]      
Ownership interest 80.50%    
Minimum [Member] | All Other [Member]      
Ownership interest 20.00%    
Maximum [Member] | All Other [Member]      
Ownership interest 50.00%