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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Revolving Credit Facility [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Interest Rate at Period End | 0.80% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Interest Rate at Period End | 1.00% |
Five year $4.4 billion credit facility [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit, Credit Facility, Maximum Borrowing Capacity | $ 4,400 |
Line of Credit Facility, Expiration Period | 5 years |
Three year $4.4 billion credit facility [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit, Credit Facility, Maximum Borrowing Capacity | $ 4,400 |
Line of Credit Facility, Expiration Period | 3 years |
364 day $3.8 billion credit facility [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit, Credit Facility, Maximum Borrowing Capacity | $ 3,800 |
Line of Credit Facility, Expiration Period | 364 days |
Subsidiaries [Member] |  |
Debt Instrument [Line Items] |  |
Other Long-term Debt | $ 1,100 | $ 1,200
Other Long-term Debt, Current | $ 347 | $ 322

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