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Fair Value Information Narrative (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets $ 27 $ 43
Derivative Liability 51 46
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Redeemable Preferred Securities Of Subsidiaries Fair Value Disclosure (61) (58)
Net Asset Value or Its Equivalent    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Company-owned life insurance (COLI) $ 68 $ 61