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Commitments and Contingencies - Lease Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Right-of-use assets $ 423 $ 384
Weighted-average remaining lease term 5 years 7 months 6 days 6 years 2 months 12 days
Weighted-average discount rate 2.57% 3.34%
Other current liabilities    
Lessee, Lease, Description [Line Items]    
Lease liabilities, current $ 109 $ 86
Other noncurrent liabilities    
Lessee, Lease, Description [Line Items]    
Lease liabilities, non-current $ 325 $ 301