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Fair Value Information (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Company-owned life insurance (“COLI”) $ 60 $ 57
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives Assets 36 56
Derivatives Liability 26 42
Estimated Fair Value, Fair Value Disclosure | Preferred securities | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Redeemable Preferred Securities Of Subsidiaries Fair Value Disclosure $ 64 $ 64