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Leases, Codification Topic 842 (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease, Cost $ 360 $ 326
Variable Lease, Cost 71 55
Operating Lease, Payments 299 277
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 371 $ 371
Lessee, Operating Lease, Lease Not yet Commenced, Value $ 226  
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 25 years