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Leases - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Total undiscounted cash flows $ 76 $ 79
Less: short term leases 0 0
Less: discount (5) (11)
Operating lease liability 71 68
Current 67 51
Non-current $ 4 $ 17