Leases (Supplemental Information) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 34
Right-of use assets obtained in exchange for new operating liabilities	88
Right-of-use asset	164
Lease liability balance: (in millions)
Short-term operating leases	35
Long-term operating leases	124
Total operating leases	$ 159
Weighted average remaining lease term	6 years 9 months 18 days
Weighted average discount rate	5.54%