Leases Leases - Other (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating Lease, Payments	$ (153)
Finance Lease, Interest Payment on Liability	(42)
Finance Lease, Principal Payments	(19)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	82
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 14