Contingencies And Commitments (Finance Lease Expense) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Contingencies and Commitments [Abstract]
Amortization of ROU assets	$ 67	[1]
Interest on lease liabilities	13	[2]
Total	$ 80	[2]

[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).