Acquisition (Schedule Of Fair Value Of Identifiable Intangible Assets Acquired) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Schedule Of Intangibles Acquired [Line Items]
Total identifiable intangible assets	$ 640
Insurance Licenses [Member]
Schedule Of Intangibles Acquired [Line Items]
Indefinite intangibles acquired	3
VOCRA [Member]
Schedule Of Intangibles Acquired [Line Items]
Finite intangibles acquired	$ 576
Weighted Average Amortization Period	20 years
VODA [Member]
Schedule Of Intangibles Acquired [Line Items]
Finite intangibles acquired	$ 31
Weighted Average Amortization Period	13 years
Business Acquired [Member]
Schedule Of Intangibles Acquired [Line Items]
Finite intangibles acquired	$ 30
Weighted Average Amortization Period	3 years