Fair Value Information (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
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
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”)	69	64
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivatives Assets	29	30
Derivatives Liability	$ 29	$ 18