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Leases - Supplemental Cash Flow information Related to Leases (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities  
Operating cash flows from operating leases $ 50
Operating cash flows from finance leases 1
Financing cash flows from finance leases 3
Right-of-use assets obtained in exchange for lease obligations  
Operating leases 24
Finance leases $ 13