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Debt - Debt (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Amount, current |  | $ 2,317 | $ 0
Unamortized Discounts and Debt Issuance Costs, current |  | (4) | 0
Carrying Amount, current |  | 2,313 | 0
Principal Amount, noncurrent |  | 14,250 | 16,000
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (112) | (118)
Carrying Amount, noncurrent |  | 14,138 | 15,882
Total debt, principal |  | 16,567 | 16,000
Unamortized Discounts and Debt Issuance Costs |  | (116) | (118)
Carrying Amount |  | $ 16,451 | 15,882
Senior Notes | 2017 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 1.20% |
Principal Amount, current |  | $ 1,750 | 0
Unamortized Discounts and Debt Issuance Costs, current |  | (3) | 0
Carrying Amount, current |  | 1,747 | 0
Principal Amount, noncurrent |  | 0 | 1,750
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | 0 | (4)
Carrying Amount, noncurrent |  | $ 0 | 1,746
Effective Interest Rate (percent) |  | 1.37% |
Senior Notes | 2020 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 2.20% |
Principal Amount, noncurrent |  | $ 3,000 | 3,000
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (12) | (12)
Carrying Amount, noncurrent |  | $ 2,988 | 2,988
Effective Interest Rate (percent) |  | 2.30% |
Senior Notes | 2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 2.80% |
Principal Amount, noncurrent |  | $ 2,250 | 2,250
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (11) | (12)
Carrying Amount, noncurrent |  | $ 2,239 | 2,238
Effective Interest Rate (percent) |  | 2.89% |
Senior Notes | 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 3.15% |
Principal Amount, noncurrent |  | $ 4,000 | 4,000
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (35) | (36)
Carrying Amount, noncurrent |  | $ 3,965 | 3,964
Effective Interest Rate (percent) |  | 3.26% |
Senior Notes | 2035 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 4.15% |
Principal Amount, noncurrent |  | $ 1,500 | 1,500
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (15) | (15)
Carrying Amount, noncurrent |  | $ 1,485 | 1,485
Effective Interest Rate (percent) |  | 4.23% |
Senior Notes | 2045 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (percent) |  | 4.30% |
Principal Amount, noncurrent |  | $ 3,500 | 3,500
Unamortized Discounts and Debt Issuance Costs, noncurrent |  | (39) | (39)
Carrying Amount, noncurrent |  | $ 3,461 | 3,461
Effective Interest Rate (percent) |  | 4.37% |
Commercial Paper |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount, current |  | $ 567 | 0
Unamortized Discounts and Debt Issuance Costs, current |  | (1) | 0
Carrying Amount, current |  | $ 566 | $ 0
Effective Interest Rate, current (percent) | [1] | 0.79% |
[1] | Represents the weighted-average interest rate for the commercial paper outstanding at December 31, 2016.

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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