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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Short-term debt and current maturities of long-term debt    
Current maturities of long-term debt $ 128 $ 55
Current maturities of capitalized lease liabilities 724 37
Short-term debt and current maturities of long-term debt 2,173 738 [1]
Long-term debt, net of current maturities    
Long-term debt 7,219 2,317
Less: current maturities 852 92
Long-term debt, net of current maturities 6,367 2,225 [1]
Term loan | GBP term loan due 2019    
Long-term debt, net of current maturities    
Long-term debt $ 250 233
Term loan | GBP term loan due 2019 | Three-month LIBOR    
Debt Information [Abstract]    
Basis spread on variable rate 0.65%  
Term loan | GBP term loan due 2019 | Minimum    
Debt Information [Abstract]    
Effective interest rate 1.00%  
Term loan | GBP term loan due 2019 | Maximum    
Debt Information [Abstract]    
Effective interest rate 1.20%  
Term loan | USD term loan due 2021    
Long-term debt, net of current maturities    
Long-term debt $ 0 571
Debt Information [Abstract]    
Basis spread on variable rate 0.50%  
Term loan | USD term loan due 2021 | Federal Funds Rate    
Debt Information [Abstract]    
Basis spread on variable rate 0.50%  
Term loan | USD term loan due 2021 | One-month LIBOR    
Debt Information [Abstract]    
Basis spread on variable rate 1.00%  
Term loan | USD term loan due 2021 | Minimum    
Debt Information [Abstract]    
Effective interest rate 1.20%  
Term loan | USD term loan due 2021 | Minimum | LIBOR    
Debt Information [Abstract]    
Basis spread on variable rate 0.75%  
Term loan | USD term loan due 2021 | Maximum    
Debt Information [Abstract]    
Effective interest rate 2.30%  
Term loan | USD term loan due 2021 | Maximum | LIBOR    
Debt Information [Abstract]    
Basis spread on variable rate 1.50%  
Term loan | AUD term loan due 2022    
Long-term debt, net of current maturities    
Long-term debt $ 215 76
Term loan | AUD term loan due 2022 | Minimum    
Debt Information [Abstract]    
Effective interest rate 2.90%  
Term loan | AUD term loan due 2022 | Minimum | Bank Bill Swap Bid Rate    
Debt Information [Abstract]    
Basis spread on variable rate 0.95%  
Term loan | AUD term loan due 2022 | Maximum    
Debt Information [Abstract]    
Effective interest rate 3.00%  
Term loan | AUD term loan due 2022 | Maximum | Bank Bill Swap Bid Rate    
Debt Information [Abstract]    
Basis spread on variable rate 1.45%  
Term loan | EUR term loan due 2022    
Long-term debt, net of current maturities    
Long-term debt $ 179 0
Debt Information [Abstract]    
Effective interest rate 0.90%  
Term loan | EUR term loan due 2022 | Minimum | Eurocurrency Rate    
Debt Information [Abstract]    
Basis spread on variable rate 0.75%  
Term loan | EUR term loan due 2022 | Maximum | Eurocurrency Rate    
Debt Information [Abstract]    
Basis spread on variable rate 1.35%  
Term loan | USD term loan due 2022    
Long-term debt, net of current maturities    
Long-term debt $ 1,149 0
Term loan | USD term loan due 2022 | Minimum    
Debt Information [Abstract]    
Effective interest rate 2.20%  
Term loan | USD term loan due 2022 | Minimum | Eurocurrency Rate    
Debt Information [Abstract]    
Basis spread on variable rate 1.00%  
Term loan | USD term loan due 2022 | Minimum | Base Rate    
Debt Information [Abstract]    
Basis spread on variable rate 0.00%  
Term loan | USD term loan due 2022 | Maximum    
Debt Information [Abstract]    
Effective interest rate 2.80%  
Term loan | USD term loan due 2022 | Maximum | Eurocurrency Rate    
Debt Information [Abstract]    
Basis spread on variable rate 1.75%  
Term loan | USD term loan due 2022 | Maximum | Base Rate    
Debt Information [Abstract]    
Basis spread on variable rate 0.75%  
Senior notes | Senior notes due 2020    
Long-term debt, net of current maturities    
Long-term debt $ 503 0
Debt Information [Abstract]    
Effective interest rate 2.875%  
Senior notes | Senior notes due 2021    
Long-term debt, net of current maturities    
Long-term debt $ 646 0
Senior notes | Senior notes due 2021 | Three-month LIBOR    
Debt Information [Abstract]    
Basis spread on variable rate 0.95%  
Senior notes | Senior notes due 2021 | Minimum    
Debt Information [Abstract]    
Effective interest rate 2.30%  
Senior notes | Senior notes due 2021 | Maximum    
Debt Information [Abstract]    
Effective interest rate 2.40%  
Senior notes | Senior notes due 2023    
Long-term debt, net of current maturities    
Long-term debt $ 278 0
Debt Information [Abstract]    
Effective interest rate 4.45%  
Senior notes | Senior notes due 2023    
Long-term debt, net of current maturities    
Long-term debt $ 174 453
Debt Information [Abstract]    
Effective interest rate 4.45%  
Senior notes | Senior notes due 2025    
Long-term debt, net of current maturities    
Long-term debt $ 507 0
Debt Information [Abstract]    
Effective interest rate 4.25%  
Senior notes | Senior notes due 2028    
Long-term debt, net of current maturities    
Long-term debt $ 509 0
Debt Information [Abstract]    
Effective interest rate 4.75%  
Senior notes | Senior notes due 2030    
Long-term debt, net of current maturities    
Long-term debt $ 357 0
Debt Information [Abstract]    
Effective interest rate 7.45%  
Credit facility | Revolving credit facility    
Long-term debt, net of current maturities    
Borrowings under long-term financing and credit facility $ 388 678
Credit facility | Revolving credit facility | Minimum    
Debt Information [Abstract]    
Effective interest rate 1.40%  
Credit facility | Revolving credit facility | Maximum    
Debt Information [Abstract]    
Effective interest rate 1.60%  
Lease credit facility | Lease credit facility    
Long-term debt, net of current maturities    
Long-term debt $ 51 60
Lease credit facility | Lease credit facility | Minimum    
Debt Information [Abstract]    
Effective interest rate 2.00%  
Lease credit facility | Lease credit facility | Maximum    
Debt Information [Abstract]    
Effective interest rate 2.60%  
Capitalized lease liabilities    
Long-term debt, net of current maturities    
Long-term debt $ 1,518 104
Capitalized lease liabilities | Minimum    
Debt Information [Abstract]    
Effective interest rate 1.10%  
Capitalized lease liabilities | Maximum    
Debt Information [Abstract]    
Effective interest rate 6.70%  
Borrowings for assets acquired under long-term financing    
Long-term debt, net of current maturities    
Borrowings under long-term financing and credit facility $ 318 77
Borrowings for assets acquired under long-term financing | Minimum    
Debt Information [Abstract]    
Effective interest rate 2.30%  
Borrowings for assets acquired under long-term financing | Maximum    
Debt Information [Abstract]    
Effective interest rate 3.20%  
Mandatorily redeemable preferred stock outstanding    
Long-term debt, net of current maturities    
Long-term debt $ 61 61
Debt Information [Abstract]    
Effective interest rate 3.50%  
Other borrowings    
Long-term debt, net of current maturities    
Long-term debt $ 116 4
Other borrowings | Minimum    
Debt Information [Abstract]    
Effective interest rate 0.50%  
Other borrowings | Maximum    
Debt Information [Abstract]    
Effective interest rate 14.00%  
Commercial paper    
Short-term debt and current maturities of long-term debt    
Short-term debt $ 841 646
Commercial paper | Minimum    
Debt Information [Abstract]    
Weighted average interest rate (0.10%)  
Commercial paper | Maximum    
Debt Information [Abstract]    
Weighted average interest rate 0.02%  
Term loan    
Short-term debt and current maturities of long-term debt    
Short-term debt $ 480 $ 0
Debt Information [Abstract]    
Effective interest rate 1.75%  
Basis spread on variable rate 1.75%  
Capital lease obligations, current | Minimum    
Debt Information [Abstract]    
Effective interest rate 1.10%  
Capital lease obligations, current | Maximum    
Debt Information [Abstract]    
Effective interest rate 6.70%  
[1] Certain prior year amounts were adjusted to retroactively reflect the legal capital of DXC.