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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Right-of-use assets $ 362 $ 362  
Lease liabilities, current 87 87  
Lease liabilities, non-current $ 278 $ 278  
Other information      
Weighted-average remaining lease term 5 years 10 months 24 days 5 years 10 months 24 days  
Weighted-average discount rate 3.32% 3.32%  
Operating lease cost $ 34 $ 102  
ASU 2016-02      
Lessee, Lease, Description [Line Items]      
Right-of-use assets     $ 350