Contingencies And Commitments (Finance Lease Expense) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2019	Jun. 30, 2019
Contingencies and Commitments [Abstract]
Amortization of ROU assets	[1]	$ 19	$ 37
Interest on lease liabilities	[2]	4	7
Total		$ 23	$ 44

[1] Amortization of ROU assets is reported in commissions and other expenses on our Consolidated Statements of Comprehensive Income (Loss).

[2] Interest on lease liabilities is reported in interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).