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Leases (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Lease expense $ 42
Operating lease cost 37
Finance lease cost 5
Depreciation of right-of-use assets 2
Interest on lease liabilities 3
Lease liabilities 29
Operating cash flows from operating leases 26
Operating cash flows from finance leases $ 3
Operating leases weighted average remaining term 11 years 10 months 24 days
Finance leases weighted average remaining term 6 years 4 months 24 days
Operating leases weighted average discount rate 3.90%
Finance leases weighted average discount rate 6.00%
Lease not yet commenced $ 450
Minimum [Member]  
Lessee, Lease, Description [Line Items]  
Lease term 10 years
Maximum [Member]  
Lessee, Lease, Description [Line Items]  
Lease term 25 years