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Leases Leases (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Lessee Disclosure [Abstract]  
Operating Lease, Cost $ 326
Variable Lease, Cost 55
Operating Lease, Payments 277
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 371
Lessee, Operating Lease, Lease Not yet Commenced, Value $ 160
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 15 years