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Commitments and Contingencies - Lease Cost (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Right-of-use assets $ 384
Lease liabilities, current 86
Lease liabilities, non-current $ 301
Weighted-average remaining lease term 6 years 2 months 12 days
Weighted-average discount rate 3.34%