Leases (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Jul. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease liability		$ 153
Operating lease assets		159
Operating lease term	10 years
Payment to previous lessor	$ 6
Operating lease not yet commenced		$ 15
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease liability			$ 105
Operating lease assets			$ 105