Leases Maturity of Lease Liabilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Maturities of Lease Liabilities [Abstract]
Operating Lease, Remainder of Fiscal Year	$ 48
Operating Lease, Year Two	147
Operating Lease, Year Three	108
Operating Lease, Year Four	81
Operating Lease, Year Five	57
Operating Lease, Year Six and Thereafter	189
Operating Lease, Total Lease Payments	630
Operating Lease, Interest	74
Operating Lease, Liability	556
Finance Lease, Remainder of Fiscal Year	1
Finance Lease, Year Two	3
Finance Lease, Year Three	2
Finance Lease, Year Four	2
Finance Lease, Year Five	1
Finance Lease, Year Six and Thereafter	2
Finance Lease, Total Lease Payments	11
Finance Lease, Interest	1
Finance Lease, Liability	$ 10