Leases Liability Maturity (Details) $ in Millions	Mar. 31, 2020 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 195
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	230
Lessee, Operating Lease, Liability, Payments, Due Year Two	199
Lessee, Operating Lease, Liability, Payments, Due Year Three	154
Lessee, Operating Lease, Liability, Payments, Due Year Four	96
Lessee, Operating Lease, Liability, Payments, Due Year Five	55
Lessee, Operating Lease, Liability, Payments, Due after Year Five	233
Lessee, Operating Lease, Liability, Payments, Due	1,162
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(175)
Operating Lease, Liability	$ 987