Leases (Unaudited) Lease Other Supplemental Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Rate
Leases Other Supplemental Information [Abstract]
Payments on operating leases	$ 153
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 101
Weighted-average remaining lease term—operating leases (in years)	10 years 3 months 18 days
Weighted-average discount rate—operating leases | Rate	3.90%