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Pensions and Other Post-Retirement Benefit Plans - Obligations and Funded Status (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Jul. 03, 2020
Retirement Benefits [Abstract]    
Benefit obligation at end of period $ 387 $ 366
Fair value of plan assets at end of period 227 215
Unfunded status $ 160 $ 151