Acquisition (Schedule Of Fair Value Of Net Assets Acquired) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,750	$ 1,368
Liberty Transaction [Member]
Business Acquisition [Line Items]
Investments	2,493
Mortgage loans on real estate	658
Cash and invested cash	113
Reinsurance recoverables	76
Premiums and fees receivable	83
Accrued investment income	24
Other intangible assets acquired	640
Other assets acquired	141
Separate account assets	99
Total assets acquired	4,327
Future contract benefits	2,930
Other contract holder funds	43
Other liabilities acquired	120
Separate account liabilities	99
Total liabilities assumed	3,192
Net identifiable assets acquired	1,135
Goodwill	382
Net assets acquired	$ 1,517