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Borrowings and Lines of Credit (ST Borrowings Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Debt Disclosure [Abstract] |  |
Maximum Commercial Paper Borrowing Authority | $ 6,350 |
Short Term Line of Credit Facilities Remaining Borrowing Capacities | $ 2,300 |
Short Term Debt Weighted Average Interest Rate, Avg Outstanding | 1.90% | 1.50%
Total Debt Weighted Average Interest Rate, Avg Outstanding | 3.70% | 3.50%
Short Term Debt Weighted Average Interest Rate, Outstanding | 3.10% | 1.20%
Total Debt Weighted Average Interest Rate, Outstanding | 3.70% | 3.50%
Line of Credit Facility [Line Items] |  |
Aggregate Line of Credit Facility Maximum Borrowing Capacity | $ 10,350 |
Multicurrency Revolving Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,150 |
Revolving Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,200 |

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