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Debt - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2018
Sep. 30, 2018
Sep. 30, 2018
May 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity   $ 5,000 $ 5,000    
Percentage of owned subsidiaries guaranteed fixed- and floating-rate notes     100.00%    
Fixed Rate Notes Due May 2020          
Debt Instrument [Line Items]          
Long term debt   2,000 $ 2,000   $ 0
Fixed Rate Notes Due May 2021          
Debt Instrument [Line Items]          
Long term debt   2,000 2,000   0
Credit Facility | 364-day Committed Bank Credit Facility          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity   $ 2,000 2,000    
Debt instrument term   364 days      
Credit Facility | 364-day Committed Bank Credit Facility | CSRA          
Debt Instrument [Line Items]          
Borrowings from line of credit $ 7,500        
Commercial Paper          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 1,700 $ 1,700    
Weighted average interest rate   2.114% 2.114%    
LIBOR | Floating Rate Notes Due May 2020          
Debt Instrument [Line Items]          
Long term debt   $ 500 $ 500   0
LIBOR | Floating Rate Notes Due May 2021          
Debt Instrument [Line Items]          
Long term debt   500 500   $ 0
Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 7,500  
Notes | LIBOR | Floating Rate Notes Due May 2020          
Debt Instrument [Line Items]          
Long term debt       500  
Notes | LIBOR | Floating Rate Notes Due May 2021          
Debt Instrument [Line Items]          
Long term debt       $ 500  
Credit Facility | Multi-year Facility Expiring November 2020          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity   1,000 1,000    
Credit Facility | Multi-year Facility Expiring March 2023          
Debt Instrument [Line Items]          
Credit facility, maximum borrowing capacity   $ 2,000 $ 2,000