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v3.20.2

Debt (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) Extension | May 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 0 |  | $ 0
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum |  |  |  |  | 4.0 |  |
Debt instrument, consolidated EBITDA to interest expense ratio |  |  |  |  | 9.1 |  |
Long-term debt repaid |  |  |  |  | $ 1,000,000,000 | $ 0 |
Accrued interest on long-term debt |  |  |  |  | $ 393,000,000 |  | $ 470,000,000
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt repaid |  |  |  | $ 1,000,000,000.0 |  |  |
Senior Notes [Member] | USD Denominated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 2,000,000,000.0 |  |  |  |  |
Senior Notes [Member] | USD Denominated Notes Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 750,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.35% |  |  |  |  |
Senior Notes [Member] | USD Denominated Notes Due 2030 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 750,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.40% |  |  |  |  |
Senior Notes [Member] | USD Denominated Notes Due 2050 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | $ 500,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 4.45% |  |  |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount | $ 3,000,000,000.0 |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |
Debt instrument, number of extensions | Extension | 2 |  |  |  |  |  |
Debt instrument, extension term | 1 year |  |  |  |  |  |
Short-term borrowings |  |  | $ 3,000,000,000.0 |  |  |  |
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% |  |
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 101.00% |  |  |  |  |

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