Leases (New Accounting) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jul. 31, 2019	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 164
Lease liability balance		159
Term of contract	10 years
Payment to previous lessor	$ 6
Increase in ROU assets		$ 56
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset			$ 105
Lease liability balance			$ 105