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Restructuring and Separation Costs - Other Restructuring Costs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Restructuring Reserve  
Accrued, beginning of period $ 0
Charges 150
Cash payments (102)
Accrued, end of period 48
Separation Costs - Former Executives  
Restructuring Reserve  
Accrued, beginning of period 0
Charges 13
Cash payments (11)
Accrued, end of period 2
One-Time Termination Benefits  
Restructuring Reserve  
Accrued, beginning of period 0
Charges 66
Cash payments (55)
Accrued, end of period 11
Other Restructuring Costs  
Restructuring Reserve  
Accrued, beginning of period 0
Charges 71
Cash payments (36)
Accrued, end of period $ 35