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Fair Value Measurements and Investments Carrying amount and estimated fair value of debt (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Carrying amount of current maturities of long-term debt | $ 1,749 | $ 0
Carrying Amount | 16,618 | 15,882
Senior Notes |  |
Debt Instrument [Line Items] |  |
Carrying amount of current maturities of long-term debt | 1,749 |
Carrying Amount | 16,618 | 15,882
Debt, Long-term and Short-term, Combined Amount | $ 18,367 | 15,882
2017 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 1.20% |
2017 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 1.20% |
Carrying amount of current maturities of long-term debt | $ 1,749 |
Carrying Amount |  | 1,746
2020 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.20% |
2020 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.20% |
Carrying Amount | $ 2,990 | 2,988
September 2022 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.15% |
September 2022 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.15% |
Carrying Amount | $ 993 | 0
2022 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.80% |
2022 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.80% |
Carrying Amount | $ 2,240 | 2,238
2025 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.15% |
2025 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.15% |
Carrying Amount | $ 3,967 | 3,964
2027 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.75% |
2027 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.75% |
Carrying Amount | $ 740 | 0
2035 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.15% |
2035 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.15% |
Carrying Amount | $ 1,485 | 1,485
2045 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.30% |
2045 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.30% |
Carrying Amount | $ 3,463 | 3,461
2047 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.65% |
2047 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.65% |
Carrying Amount | $ 740 | 0
Estimate of Fair Value Measurement | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 19,171 | 17,158
Estimate of Fair Value Measurement | 2017 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 1,751 | 1,754
Estimate of Fair Value Measurement | 2020 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 3,031 | 3,077
Estimate of Fair Value Measurement | September 2022 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 997 | 0
Estimate of Fair Value Measurement | 2022 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 2,301 | 2,359
Estimate of Fair Value Measurement | 2025 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 4,098 | 4,225
Estimate of Fair Value Measurement | 2027 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 737 | 0
Estimate of Fair Value Measurement | 2035 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 1,637 | 1,698
Estimate of Fair Value Measurement | 2045 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | 3,873 | 4,045
Estimate of Fair Value Measurement | 2047 Notes | Senior Notes |  |
Debt Instrument [Line Items] |  |
Estimated Fair Value | $ 746 | $ 0

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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