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Derivatives - Fair Value Hedges (Details) € in Millions | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) interestRateSwap | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2014 USD ($) | Nov. 30, 2013 EUR (€)
Fixed rate medium term note due 2019 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 625,000,000 |
Interest rate contracts |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount |  | $ 800,000,000 |  |  |  |  |
Fair value hedges | Eurobond Due 2021 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  | € 600
Fair value hedges | June 2014 medium term notes issued |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 950,000,000 |
Fair value hedges | Fixed rate medium term note due 2019 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 625,000,000 |
Fair value hedges | August 2015 medium term notes issued |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount | $ 1,500,000,000 |  |  |  |  |  |
Fair value hedges | Fixed rate medium term note due 2021 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Principal amount |  |  | $ 400,000,000 | $ 400,000,000 |  |  |
Fair value hedges | Interest rate contracts |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Number of interest rate swap contracts entered in period | interestRateSwap | 2 |  |  |  |  |  |
Fair value hedges | Interest rate contracts | Eurobond Due 2021 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount | € |  |  |  |  |  |  | € 300
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2019 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  | $ 600,000,000 |
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2018 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount | $ 450,000,000 |  |  |  |  |  |
Term of debt instrument (in years) | 3 years |  |  |  |  |  |
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2020 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount | $ 300,000,000 |  |  |  | $ 200,000,000 |  |
Term of debt instrument (in years) | 5 years |  |  |  |  |  |
Fair value hedges | Interest rate contracts | Fixed rate medium term note due 2021 |  |  |  |  |  |  |
Derivatives in Fair Value Hedging Relationships |  |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 200,000,000 |  |  |

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