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v3.20.1

Debt (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Aug. 01, 2018 Extension
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings | $ 3,000,000,000.0 |  | $ 0 |
Face amount |  |  | 0 |
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum | 4.0 |  |  |
Debt instrument, consolidated EBITDA to interest expense ratio | 9.0 |  |  |
Interest payable, short-term borrowings | $ 1,000,000 |  |  |
Long-term debt repaid | 1,000,000,000 | $ 0 |  |
Accrued interest on long-term debt | 270,000,000 |  | $ 470,000,000 |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt repaid | $ 1,000,000,000 |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, number of extensions | Extension |  |  |  | 2
Debt instrument, expected repayment period | 1 year |  |  |
Debt instrument, extension term | 1 year |  |  |
Debt instrument, interest rate during period | 2.23% |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility Due August 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 3,000,000,000.0 |  |  |
Debt instrument, term | 5 years |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |

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