Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	$ 1,000,000
Derivatives designated for hedges of investments in foreign operations		$ 0
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		2,000,000
Notional amount of bank and insurance trust preferred CDOs		6,824,000,000	$ 6,209,000,000
Cash collateral pledged for derivative liabilities		38,000,000
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		1,000,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		1,000,000	1,000,000
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		40,000,000	59,000,000
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized		$ 40,000,000	$ 59,000,000