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Short-term Financing (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt | $ 0 |  | $ 0 |  |
Commercial paper | 0 |  | $ 0 |  | $ 0
Maturities of short-term funding agreements |  |  | overnight to up to five business days |  |
Obligations under reverse repurchase agreements | 0 |  | $ 0 |  | $ 0
364-day credit agreement |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum borrowing capacity under credit facilities | 3,500,000,000 |  | $ 3,500,000,000 |  |
Term of credit agreement |  |  | 364 days |  |
Expiration date of credit facilities |  |  | Jun. 16, 2018 |  |
Extension option term |  |  | 1 year |  |
Credit Facility Expiring In June 2022 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum borrowing capacity under credit facilities | 2,250,000,000 |  | $ 2,250,000,000 |  |
Term of credit agreement |  |  | 5 years |  |
Expiration date of credit facilities |  |  | Jun. 17, 2022 |  |
Line of credit facility potentially available increase in maximum borrowing capacity |  |  | $ 500,000,000 |  |
Credit facility maturing June 2021 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Maximum borrowing capacity under credit facilities | 3,750,000,000 |  | $ 3,750,000,000 |  |
Term of credit agreement |  |  | 5 years |  |
Expiration date of credit facilities |  |  | Jun. 18, 2021 |  |
Line of credit facility potentially available increase in maximum borrowing capacity |  |  | $ 500,000,000 |  |
Commercial paper program |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Aggregate amount of commercial paper issuable under the short-term commercial paper program |  |  | $ 9,500,000,000 |  |
Maturities of commercial paper range |  |  | overnight to up to 364 days |  |
Short-term debt, average outstanding amount | $ 3,500,000,000 | $ 4,200,000,000 | $ 3,700,000,000 | $ 4,200,000,000 |
Debt instrument, interest rate during period | 1.20% | 0.50% | 1.20% | 0.50% |
Short Term Commercial Paper Program |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Commercial paper weighted average maturity |  |  | 2 days | 2 days |
Reverse repurchase agreements |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt, average outstanding amount | $ 537,000,000 | $ 267,600,000 | $ 531,600,000 | $ 313,400,000 |
Debt instrument, interest rate during period | 1.20% | 0.50% | 1.10% | 0.50% |

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