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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Narrative (Details) $ in Millions | 36 Months Ended | 37 Months Ended | 60 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2021 | Mar. 31, 2019 | Nov. 13, 2023 | Sep. 30, 2019 USD ($) | Feb. 13, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 13, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 22, 2016 USD ($) | May 31, 2014 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 7,300 |  |  |  |  |  |
Revolving Credit Facilities due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 3,000 |  |  | $ 3,000 |  |  |
Revolving Credit Facilities due 2024 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |  |  |  |  |
Revolving Credit Facilities due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 3,000 |  |  | $ 3,000 |  |  |
Revolving Credit Facilities due 2022 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 3 years |  |  |  |  |  |  |  |  |
Revolving Credit Facilities due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  |  |  |  |  |  | 0.60 |  |  |
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 1,300 |  |  |  |  |  |
Percentage of outstanding amounts borrowed utilized as collateral |  |  |  |  |  | 105.00% |  |  |  |  |
Interest rate in addition to LIBOR |  |  |  |  |  | 0.75% |  |  |  |  |
Short-term borrowings and finance lease obligations |  |  |  |  | 1,129 | $ 1,300 | $ 0 |  | $ 1,300 |  |
Accounts and Notes Receivable [Member] | Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, amount pledged as collateral |  |  |  |  | 1,186 |  |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  | $ 115 |  | $ 5,775 |  | $ 9,883 |  |
Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] |  |  |  |  |  |  |  |  | $ 4,500 |
Debt Instrument, Term | [1] |  | 3 years |  |  |  |  |  |  |  |
EID [Member] | Revolving Credit Facilities due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 3,000
EID [Member] | Term Loan Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] |  |  |  |  |  |  |  |  | $ 4,500 |
[1] | The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020 and, subsequently, the facility was repaid and terminated in May 2019.

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