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Long-Term Debt (Details 4) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 06, 2018
Oct. 13, 2017
Debt Instrument [Line Items]            
Long-term debt   $ 14,400        
Long-term Debt, Fair Value   14,300 $ 16,000      
Interest paid, net of interest received   $ 456 273 $ 299    
Two Year Term [Member] [Domain]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   1.89%        
October2017Notes [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 8,250
2020Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 1,000
Debt Instrument, Interest Rate, Stated Percentage           2.08%
2022Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 1,500
Debt Instrument, Interest Rate, Stated Percentage           2.55%
2025Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 1,500
Debt Instrument, Interest Rate, Stated Percentage           2.93%
2028Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 2,000
Debt Instrument, Interest Rate, Stated Percentage           3.25%
2047Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 2,250
Debt Instrument, Interest Rate, Stated Percentage           4.03%
April 2018 Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Repayments of Debt     $ 200      
February 2027 Maturity [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 750     $ 750    
Debt Instrument, Interest Rate, Stated Percentage 3.20%     3.20%    
Debt Instrument, Maturity Date Feb. 01, 2027          
Orbital ATK [Member]            
Debt Instrument [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt         $ 1,687