Retirement and Deferred Compensation Plans (Deferred Compensation Plans Liabilities and Investment) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Total liabilities	[1]	$ 547	$ 588
Investments dedicated to fund liabilities	[2]	$ 170	$ 182

[1] Reported in other liabilities on our Consolidated Balance Sheets.

[2] Reported in other assets on our Consolidated Balance Sheets.