Leases Supplemental Balance Sheet Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 495
Accrued expenses and other current liabilities	101
Long-term lease liabilities included within Operating lease liabilities	443
Total operating lease liabilities	$ 544
Weighted average remaining lease term	8 years 9 months 18 days
Weighted average discount rate	3.80%