Leases Lessee Disclosure - Lease Liability Maturity Table (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee Disclosure - Lease Maturity Table [Abstract]
Lessee, Liability, Payments, Due Next Twelve Months	$ 157
Lessee, Liability, Payments, Due Year Two	146
Lessee, Liability, Payments, Due Year Three	118
Lessee, Liability, Payments, Due Year Four	89
Lessee, Liability, Payments, Due Year Five	66
Lessee, Liability, Payments, Due after Year Five	153
Lessee, Liability, Payments, Due	729
Lease, Liability, Undiscounted Excess Amount	105
Lease, Liability	624
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	144
Lessee, Operating Lease, Liability, Payments, Due Year Two	135
Lessee, Operating Lease, Liability, Payments, Due Year Three	110
Lessee, Operating Lease, Liability, Payments, Due Year Four	85
Lessee, Operating Lease, Liability, Payments, Due Year Five	64
Lessee, Operating Lease, Liability, Payments, Due after Year Five	153
Total	691
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	102
Operating Lease, Liability	589
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, Payments, Due Next Twelve Months	13
Finance Lease, Liability, Payments, Due Year Two	11
Finance Lease, Liability, Payments, Due Year Three	8
Finance Lease, Liability, Payments, Due Year Four	4
Finance Lease, Liability, Payments, Due Year Five	2
Finance Lease, Liability, Payments, Due after Year Five	0
Finance Lease, Liability, Payment, Due	38
Finance Lease, Liability, Undiscounted Excess Amount	3
Finance Lease, Liability	$ 35