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Long-Term Obligations and Other Short-Term Borrowings (Long-Term Debt) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Nov. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |
Accounts payable |  | $ 17,306,000,000 | $ 14,368,000,000 |  |
Loss on extinguishment of debt | $ 60,000,000 | $ 0 | 60,000,000 | $ 0 |
Loss on extinguishment of debt, net of tax | 37,000,000 |  |  |  |
Make-whole premium | 80,000,000 |  |  |  |
Unamortized debt issuance costs | 2,000,000 |  |  |  |
Fair value adjustment related to previously terminated swaps | $ 22,000,000 |  | $ 22,000,000 |  |
1.7% Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 1.70% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
1.9% Notes due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 1.90% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
1.95% Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 1.95% | 1.95% |  |
Principal amount of debt |  |  | $ 550,000,000 |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
2.4% Notes due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 2.40% |  |  | 2.40%
Principal amount of debt |  |  |  |  | $ 450,000,000
Offer as percentage of principal amount |  | 101.00% |  |  |
3.2% Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 3.20% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
3.2% Notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 3.20% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
3.5% Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 3.50% |  |  | 3.50%
Principal amount of debt |  |  |  |  | $ 400,000,000
Offer as percentage of principal amount |  | 101.00% |  |  |
3.75% Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 3.75% | 3.75% |  |
Principal amount of debt |  |  | $ 500,000,000 |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
4.5% Notes due 2044 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.50% |  |  | 4.50%
Principal amount of debt |  |  |  |  | $ 350,000,000
Offer as percentage of principal amount |  | 101.00% |  |  |
4.6% Notes due 2043 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.60% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
4.625% Notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.625% |  |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
4.9% Notes due 2045 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.90% | 4.90% |  |
Principal amount of debt |  |  | $ 450,000,000 |  |
Offer as percentage of principal amount |  | 101.00% |  |  |
7.0% Debentures due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 7.00% |  |  |
7.0% Debentures due 2026 | Allegiance Corporation |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 7.00% |  |  |
7.8% Debentures due 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 7.80% |  |  |
7.8% Debentures due 2016 | Allegiance Corporation |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 7.80% |  |  |
4.0% Notes due 2015 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |
Redemption price (as a percentage) | 100.00% |  |  |  |
5.8% Notes due 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 5.80% |  |  |  |
Redemption price (as a percentage) | 100.00% |  |  |  |
5.85% Notes due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 5.85% |  |  |  |
Redemption price (as a percentage) | 100.00% |  |  |  |
6.0% Notes due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 6.00% |  |  |  |
Redemption price (as a percentage) | 100.00% |  |  |  |

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