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Debt - Senior Notes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |
Long-term Debt, Current Maturities | $ 1,749 | $ 0
Carrying amount (long-term) | 16,618 | 15,882
Principal amount | $ 18,500 |
2017 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 1.20% |
2020 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.20% |
September 2022 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.15% |
2022 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.80% |
2025 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.15% |
2027 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 2.75% |
2035 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.15% |
2045 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.30% |
2047 Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.65% |
Senior Notes |  |
Debt Instrument [Line Items] |  |
long-term debt, current maturities, gross | $ 1,750 |
Principal amount | 16,750 | 16,000
Unamortized discounts and debt issuance costs (current maturities) | (1) |
Long-term Debt, Current Maturities | 1,749 |
Unamortized discounts and debt issuance costs (long-term) | (132) | (118)
Carrying amount (long-term) | 16,618 | 15,882
Principal amount | 18,500 | 16,000
Unamortized discounts and debt issuance costs | 133 | 118
Carrying amount | 18,367 | 15,882
Senior Notes | 2017 Notes |  |
Debt Instrument [Line Items] |  |
long-term debt, current maturities, gross | 1,750 |
Principal amount |  | 1,750
Unamortized discounts and debt issuance costs (current maturities) | (1) |
Long-term Debt, Current Maturities | $ 1,749 |
Unamortized discounts and debt issuance costs (long-term) |  | (4)
Carrying amount (long-term) |  | 1,746
Effective interest rate (percent) | 1.37% |
Stated interest rate (percent) | 1.20% |
Redemption price, additional basis spread (percent) | 0.05% |
Senior Notes | 2020 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 3,000 | 3,000
Unamortized discounts and debt issuance costs (long-term) | (10) | (12)
Carrying amount (long-term) | $ 2,990 | 2,988
Effective interest rate (percent) | 2.30% |
Stated interest rate (percent) | 2.20% |
Redemption price, additional basis spread (percent) | 0.10% |
Senior Notes | September 2022 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 1,000 | 0
Unamortized discounts and debt issuance costs (long-term) | (7) | 0
Carrying amount (long-term) | $ 993 | 0
Effective interest rate (percent) | 2.30% |
Stated interest rate (percent) | 2.15% |
Redemption price, additional basis spread (percent) | 0.10% |
Senior Notes | 2022 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 2,250 | 2,250
Unamortized discounts and debt issuance costs (long-term) | (10) | (12)
Carrying amount (long-term) | $ 2,240 | 2,238
Effective interest rate (percent) | 2.89% |
Stated interest rate (percent) | 2.80% |
Redemption price, additional basis spread (percent) | 0.125% |
Senior Notes | 2025 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 4,000 | 4,000
Unamortized discounts and debt issuance costs (long-term) | (33) | (36)
Carrying amount (long-term) | $ 3,967 | 3,964
Effective interest rate (percent) | 3.26% |
Stated interest rate (percent) | 3.15% |
Redemption price, additional basis spread (percent) | 0.15% |
Senior Notes | 2027 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 750 | 0
Unamortized discounts and debt issuance costs (long-term) | (10) | 0
Carrying amount (long-term) | $ 740 | 0
Effective interest rate (percent) | 2.91% |
Stated interest rate (percent) | 2.75% |
Redemption price, additional basis spread (percent) | 0.125% |
Senior Notes | 2035 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 1,500 | 1,500
Unamortized discounts and debt issuance costs (long-term) | (15) | (15)
Carrying amount (long-term) | $ 1,485 | 1,485
Effective interest rate (percent) | 4.23% |
Stated interest rate (percent) | 4.15% |
Redemption price, additional basis spread (percent) | 0.20% |
Senior Notes | 2045 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 3,500 | 3,500
Unamortized discounts and debt issuance costs (long-term) | (37) | (39)
Carrying amount (long-term) | $ 3,463 | 3,461
Effective interest rate (percent) | 4.37% |
Stated interest rate (percent) | 4.30% |
Redemption price, additional basis spread (percent) | 0.20% |
Senior Notes | 2047 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 750 | 0
Unamortized discounts and debt issuance costs (long-term) | (10) | 0
Carrying amount (long-term) | $ 740 | $ 0
Effective interest rate (percent) | 3.73% |
Stated interest rate (percent) | 3.65% |
Redemption price, additional basis spread (percent) | 0.15% |

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