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GUARANTEES, LEASES AND COMMITMENTS - Leases (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Operating lease ROU asset $ 2,900 $ 2,900
Operating lease, liability 3,102 3,102
Sublease income 14 35
Operating lease expense 265 537
Operating cash outflows related to operating leases 252 486
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Remaining 2019 436 436
2020 716 716
2021 592 592
2022 464 464
2023 355 355
Thereafter 930 930
Total future lease payments 3,493 3,493
Less imputed interest (based on weighted-average discount rate of 3.7%) (391) (391)
Lease liability $ 3,102 $ 3,102
Operating lease, weighted average discount rate 3.70% 3.70%
Weighted Average    
Lessee, Lease, Description [Line Items]    
Operating lease term 6 years 6 years