Leases - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Lease assets	$ 192
Lease liabilities	$ 188
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	10 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Lease assets		$ 68
Lease liabilities		$ 66