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Leases - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Other assets $ 521 $ 502  
Operating lease, liability 613 636  
Operating lease, payments 193 202  
Right-of-use asset obtained in exchange for operating lease liability $ 163 $ 232  
Operating lease, weighted average remaining lease term 8 years 8 years  
Operating lease, weighted average discount rate 4.20% 4.10%  
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Other assets     $ 458
Operating lease, liability     $ 574