New Accounting Standards (Narrative) (Details) $ in Millions	Sep. 30, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU asset	$ 174
Operating lease liability	179
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU asset	171
Operating lease liability	$ 176