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Long-Term Debt and Short-Term Borrowings - Long-Term Debt Issuances and Fixed-to-Floating Interest Rate Swaps (Details) - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Aug. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021
Interest rate contracts |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 800,000,000 |
Floating rate registered note due 2049 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  |  | 500,000,000 |
Floating rate registered note due 2050 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  |  | 300,000,000 |
Fixed rate registered note due 2049 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 |  | $ 500,000,000 | 1,000,000,000 |
Term of debt instrument (in years) |  | 30 years |  |  |  |
Coupon rate |  | 3.25% |  | 3.37% |  |
Fixed rate registered note due 2050 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  | $ 350,000,000 | $ 650,000,000 | $ 650,000,000
Term of debt instrument (in years) | 30 years |  |  |  |  |
Coupon rate |  |  |  | 3.72% |  | 3.70%
Aggregate fixed rate registered notes |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,750,000,000
Fixed rate registered note due 2025 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  | $ 750,000,000 |  | $ 500,000,000
Term of debt instrument (in years) | 5 years | 5 years 6 months |  |  |  |
Coupon rate |  | 2.00% |  | 2.12% |  | 2.65%
Fixed rate registered note due 2030 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  | $ 600,000,000 |  | $ 600,000,000
Term of debt instrument (in years) | 10 years |  |  |  |  |
Coupon rate |  |  |  | 3.09% |  | 3.05%
Aggregate fixed rate medium-term notes |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  | $ 2,250,000,000 |  |  |
Fixed rate medium term note due 2022 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  | $ 450,000,000 | $ 600,000,000 |  |
Term of debt instrument (in years) |  |  | 3 years |  |  |
Coupon rate |  |  | 2.75% | 2.17% |  |
Fixed rate medium term notes due 2024 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  | $ 500,000,000 | $ 500,000,000 |  |
Term of debt instrument (in years) |  |  | 5 years |  |  |
Coupon rate |  |  | 3.25% | 2.98% |  |
Fixed rate medium term notes due 2029 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  | $ 800,000,000 | $ 800,000,000 |  |
Term of debt instrument (in years) |  |  | 10 years |  |  |
Coupon rate |  |  | 3.375% | 3.38% |  |
Fixed rate medium term note due 2048 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  | $ 500,000,000 | $ 500,000,000 |  |
Term of debt instrument (in years) |  |  | 29 years 6 months |  |  |
Coupon rate |  |  | 4.00% | 3.78% |  |
Floating rate medium term notes due 2024 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  |  |  | $ 300,000,000 |  |
Term of debt instrument (in years) |  |  | 5 years |  |  |
Coupon rate |  |  |  | 0.42% |  |
Fixed rate registered notes which are due in 2023, 2025, 2029 and 2049 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  | $ 3,250,000,000 |  |  |  |
Fixed rate registered note due 2023 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  | $ 500,000,000 |  | $ 500,000,000 |  |
Term of debt instrument (in years) |  | 3 years 6 months |  |  |  |
Coupon rate |  | 1.75% |  | 1.86% |  |
Fixed rate registered note due 2029 |  |  |  |  |  |
Debt instrument |  |  |  |  |  |
Principal amount |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |
Term of debt instrument (in years) |  | 10 years |  |  |  |
Coupon rate |  | 2.375% |  | 2.50% |  |

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