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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Available Credit Facilities (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Nov. 13, 2018
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Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 7,300 |
Line of Credit Facility, Remaining Borrowing Capacity | 6,142 |
Revolving Credit Facilities due 2024 [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 3,000 | $ 3,000
Line of Credit Facility, Remaining Borrowing Capacity | 3,000 |
Revolving Credit Facilities due 2022 [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 3,000 | $ 3,000
Line of Credit Facility, Remaining Borrowing Capacity | 2,971 |
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,300 |
Line of Credit Facility, Remaining Borrowing Capacity | $ 171 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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