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Fair Value Information (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Redeemable Preferred Securities Of Subsidiaries Fair Value Disclosure $ 58 $ 58
Fair Value, Measurements, Recurring | Net Asset Value or Its Equivalent    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Company-owned life insurance (“COLI”) 66 61
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives Liability 69 46
Derivatives Assets $ 50 $ 43