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Long-Term Debt and Short-Term Borrowings - Long-Term Debt Maturities (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Oct. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2016
Debt instrument |  |  |  |
Debt repurchases |  | $ 305 |  |
Loss on early debt extinguishment | $ 96 |  |  |
Fixed rate medium term notes repaid June 2017 |  |  |  |
Debt instrument |  |  |  |
Principal amount |  |  | $ 650 |
Notes Due 2028 |  |  |  |
Debt instrument |  |  |  |
Debt repurchases |  | 110 |  |
Principal amount |  | $ 330 |  |
Interest rate, stated percentage (as a percent) |  | 6.375% |  |
Notes Due 2037 |  |  |  |
Debt instrument |  |  |  |
Debt repurchases |  | $ 195 |  |
Principal amount |  | $ 750 |  |
Interest rate, stated percentage (as a percent) |  | 5.70% |  |
Fixed rate medium term notes repaid 2016 |  |  |  |
Debt instrument |  |  |  |
Principal amount |  |  |  | $ 1,000

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