Leasing Present Value of Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 118
Finance Lease, Liability, Payments, Remainder of Fiscal Year	11
Lessee, Operating Lease, Liability, Payments, Due Year Two	88
Finance Lease, Liability, Payments, Due Year Two	11
Lessee, Operating Lease, Liability, Payments, Due Year Three	66
Finance Lease, Liability, Payments, Due Year Three	10
Lessee, Operating Lease, Liability, Payments, Due Year Four	46
Finance Lease, Liability, Payments, Due Year Four	5
Lessee, Operating Lease, Liability, Payments, Due Year Five	37
Finance Lease, Liability, Payments, Due Year Five	0
Lessee, Operating Lease, Liability, Payments, Due after Year Five	272
Finance Lease, Liability, Payments, Due after Year Five	0
Lessee, Operating Lease, Liability, Payments, Due	627
Finance Lease, Liability, Payment, Due	37
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(167)
Finance Lease, Liability, Undiscounted Excess Amount	(2)
Operating Lease, Liability	460
Finance Lease, Liability	$ 35