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Fair Value Information Narrative (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative Assets $ 30 $ 27
Derivative Liability 18 51
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 61
Net Asset Value or Its Equivalent    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Company-owned life insurance (COLI) $ 64 $ 68