Annual report pursuant to Section 13 and 15(d)

Leases - Narrative (Details)

v3.19.3.a.u2
Leases - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
leases
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Right-of-use assets   $ 661    
Operating lease liability   783    
Straight-line lease liabilities   (1,732)   $ (1,259)
Operating lease expense   203    
Lease liabilities reduced by cash paid   227    
Right-of-use assets obtained in exchange for operating lease liability   162    
Lease liability for leases commenced   162    
Operating lease not yet commenced, liability   $ 101    
Leases not yet commenced, number of leases executed | leases 2      
Weighted average remaining lease term   6 years 7 months 6 days    
Weighted average discount rate for operating leases   4.20%    
Maximum        
Lessee, Lease, Description [Line Items]        
Lease term   10 years    
ASU 2016-02        
Lessee, Lease, Description [Line Items]        
Right-of-use assets     $ 661  
Operating lease liability     774  
Straight-line lease liabilities     $ 113