Leases and Commitments Leases and Commitments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Right-of-Use asset obtained in exchange for operating lease liability	$ 4
Operating lease costs	24
Short-term lease costs	18
Total lease rent expense		$ 42	$ 40
Operating cash flows for operating leases	$ 24
Minimum [Member]
Lessee, Lease, Description [Line Items]
Renewal terms	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Renewal terms	5 years