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Long-Term Debt and Short-Term Borrowings - Long-Term Debt Issuances (Details) $ in Millions, € in Billions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Oct. 31, 2017 USD ($) | Aug. 31, 2015 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | May 31, 2016 EUR (€)
Fixed rate medium term note due 2021 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | $ 400 |  |  |  |  |  |
Term of debt instrument | 3 years |  |  |  |  |  |
Interest rate - effective | 3.00% |  |  |  |  |  |
Variable rate |  |  |  | three-month LIBOR |  |  |
Fixed rate medium term notes due 2023 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount |  | $ 650 |  | $ 650 |  |  |
Term of debt instrument |  | 5 years 6 months |  |  |  |  |
Interest rate - effective |  | 2.25% |  | 2.26% |  |  |
Fixed rate medium term notes due 2024 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | $ 300 |  |  | $ 300 |  |  |
Term of debt instrument | 5 years 6 months |  |  |  |  |  |
Interest rate - effective | 3.25% |  |  | 3.30% |  |  |
Floating rate medium term notes due 2024 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | $ 300 |  |  | $ 300 |  |  |
Term of debt instrument | 5 years 6 months |  |  |  |  |  |
Interest rate - effective |  |  |  | 2.91% |  |  |
Variable rate |  |  |  | three-month LIBOR |  |  |
Fixed rate medium term notes due 2027 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount |  | $ 850 |  | $ 850 |  |  |
Term of debt instrument |  | 10 years |  |  |  |  |
Interest rate - effective |  | 2.875% |  | 2.95% |  |  |
Fixed rate medium term notes due 2028 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | $ 600 |  |  | $ 600 |  |  |
Term of debt instrument | 10 years |  |  |  |  |  |
Interest rate - effective | 3.625% |  |  | 3.62% |  |  |
Fixed rate medium term note due 2047 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount |  | $ 500 |  | $ 500 |  |  |
Term of debt instrument |  | 30 years |  |  |  |  |
Interest rate - effective |  | 3.625% |  | 3.68% |  |  |
Fixed rate medium term note due 2048 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | $ 650 |  |  | $ 650 |  |  |
Term of debt instrument | 30 years |  |  |  |  |  |
Interest rate - effective | 4.00% |  |  | 4.07% |  |  |
May 2016 Euro medium term notes issued |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  | € 1
September 2016 medium term notes issued |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,750 |
Interest rate swap contracts | Fixed rate medium term note due 2021 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Derivative notional amount | $ 200 |  |  |  |  |  |
Variable rate |  |  |  | three-month LIBOR |  |  |
Fair value hedges | Interest rate swap contracts | Fixed rate medium term note due 2020 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Term of debt instrument |  |  | 5 years |  |  |  |
Derivative notional amount |  |  | $ 300 |  | $ 200 |  |
Variable rate |  |  |  | three-month LIBOR |  |  |
Fair value hedges | Interest rate swap contracts | Fixed rate medium term note due 2021 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Derivative notional amount | $ 200 |  |  |  |  |  |
Fair value hedges | Interest rate swap contracts | Fixed rate medium term note due 2018 |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |
Term of debt instrument |  |  | 3 years |  |  |  |
Derivative notional amount |  |  | $ 450 |  |  |  |

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