Acquisition (Schedule Of Fair Value Of Net Assets Acquired) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,757	$ 1,368
Liberty Transaction [Member]
Business Acquisition [Line Items]
Investments	2,493
Mortgage loans on real estate	658
Cash and invested cash	107
Reinsurance recoverables	76
Premiums and fees receivable	83
Accrued investment income	24
Other intangible assets acquired	640
Other assets acquired	142
Separate account assets	99
Total assets acquired	4,322
Future contract benefits	2,930
Other contract holder funds	46
Other liabilities acquired	120
Separate account liabilities	99
Total liabilities assumed	3,195
Net identifiable assets acquired	1,127
Goodwill	390
Net assets acquired	$ 1,517