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Restructuring, Facility Consolidation and Severance Charges (Restructuring Liability) (Details) - Severance and Other Restructuring Liabilities
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Restructuring Reserve [Roll Forward]  
Accrued balance at beginning of period $ 66
Restructuring Charges 83
Cash Payments (75)
Other (12)
Accrued balance at end of period $ 62