Long-Term Debt	6 Months Ended
Jul. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	LONG-TERM DEBT In February 2016, the Company issued $1.35 billion of 2.00% senior notes due April 1, 2021 (the "2021 notes") at a discount of $5 million, $1.3 billion of 3.00% senior notes due April 1, 2026 (the "2026 notes") at a discount of $8 million, and $350 million of 4.25% senior notes due April 1, 2046 (the "2046 notes") at a premium of $2 million (together, the "February 2016 issuance"). The 2046 notes form a single series with the Company's $1.25 billion of 4.25% senior notes due April 1, 2046 that were issued in May 2015, and have the same terms. The aggregate principal amount outstanding of the Company's senior notes due April 1, 2046 is $1.6 billion. Interest on the 2021 and 2026 notes is due semi-annually on April 1 and October 1 of each year, beginning October 1, 2016. Interest on the 2046 notes is due semi-annually on April 1 and October 1 of each year, beginning April 1, 2016, with interest accruing from October 1, 2015. The $13 million discount associated with the 2021 and 2026 notes and the $2 million premium associated with the 2046 notes are being amortized over the term of the notes using the effective interest rate method. Issuance costs of $17 million associated with the February 2016 issuance were recorded as a direct deduction to the senior notes and are being amortized over the term of the notes. The net proceeds of the February 2016 issuance were used to repay the Company's 5.40% senior notes that matured on March 1, 2016. All of the Company's senior notes, other than the $500 million of floating rate senior notes due September 15, 2017, may be redeemed by the Company at any time, in whole or in part, at the redemption price plus accrued interest up to the redemption date. The redemption price is equal to the greater of (1) 100% of the principal amount of the notes to be redeemed, and (2) the sum of the present values of the remaining scheduled payments of principal and interest to the Par Call Date, as defined in the respective notes. Additionally, if a Change in Control Triggering Event occurs, as defined in the notes, holders of all notes have the right to require the Company to redeem those notes at 101% of the aggregate principal amount of the notes plus accrued interest up to the redemption date. The Company is generally not limited under the indentures governing the notes in its ability to incur additional indebtedness or required to maintain financial ratios or specified levels of net worth or liquidity. Further, while the indentures governing the notes contain various restrictive covenants, none are expected to impact the Company's liquidity or capital resources. In fiscal 2015, the Company entered into forward starting interest rate swap agreements with a combined notional amount of $1.0 billion, accounted for as cash flow hedges, to hedge interest rate fluctuations in anticipation of the February 2016 issuance. In connection with the February 2016 issuance, the Company paid $89 million to settle these forward starting interest rate swap agreements. This amount, net of income taxes, is included in Accumulated Other Comprehensive Loss and is being amortized to Interest Expense over the term of the 2026 notes.

LONG-TERM DEBT

In February 2016, the Company issued $1.35 billion of 2.00% senior notes due April 1, 2021 (the "2021 notes") at a discount of $5 million, $1.3 billion of 3.00% senior notes due April 1, 2026 (the "2026 notes") at a discount of $8 million, and $350 million of 4.25% senior notes due April 1, 2046 (the "2046 notes") at a premium of $2 million (together, the "February 2016 issuance"). The 2046 notes form a single series with the Company's $1.25 billion of 4.25% senior notes due April 1, 2046 that were issued in May 2015, and have the same terms. The aggregate principal amount outstanding of the Company's senior notes due April 1, 2046 is $1.6 billion. Interest on the 2021 and 2026 notes is due semi-annually on April 1 and October 1 of each year, beginning October 1, 2016. Interest on the 2046 notes is due semi-annually on April 1 and October 1 of each year, beginning April 1, 2016, with interest accruing from October 1, 2015. The $13 million discount associated with the 2021 and 2026 notes and the $2 million premium associated with the 2046 notes are being amortized over the term of the notes using the effective interest rate method. Issuance costs of $17 million associated with the February 2016 issuance were recorded as a direct deduction to the senior notes and are being amortized over the term of the notes. The net proceeds of the February 2016 issuance were used to repay the Company's 5.40% senior notes that matured on March 1, 2016.

All of the Company's senior notes, other than the $500 million of floating rate senior notes due September 15, 2017, may be redeemed by the Company at any time, in whole or in part, at the redemption price plus accrued interest up to the redemption date. The redemption price is equal to the greater of (1) 100% of the principal amount of the notes to be redeemed, and (2) the sum of the present values of the remaining scheduled payments of principal and interest to the Par Call Date, as defined in the respective notes. Additionally, if a Change in Control Triggering Event occurs, as defined in the notes, holders of all notes have the right to require the Company to redeem those notes at 101% of the aggregate principal amount of the notes plus accrued interest up to the redemption date. The Company is generally not limited under the indentures governing the notes in its ability to incur additional indebtedness or required to maintain financial ratios or specified levels of net worth or liquidity. Further, while the indentures governing the notes contain various restrictive covenants, none are expected to impact the Company's liquidity or capital resources.

In fiscal 2015, the Company entered into forward starting interest rate swap agreements with a combined notional amount of $1.0 billion, accounted for as cash flow hedges, to hedge interest rate fluctuations in anticipation of the February 2016 issuance. In connection with the February 2016 issuance, the Company paid $89 million to settle these forward starting interest rate swap agreements. This amount, net of income taxes, is included in Accumulated Other Comprehensive Loss and is being amortized to Interest Expense over the term of the 2026 notes.