Short-Term and Long-Term Debt - Credit Facilities and Letters of Credit (Details) |
Dec. 31, 2024
USD ($)
|
|---|---|
| Line of Credit Facility [Line Items] | |
| Maximum Available | $ 3,792,000,000 |
| LOCs Issued | 1,972,000,000 |
| Five-year revolving credit facility | |
| Line of Credit Facility [Line Items] | |
| Maximum Available | 2,000,000,000 |
| LOCs Issued | 250,000,000 |
| LOC facility, due August 2031 | |
| Line of Credit Facility [Line Items] | |
| Maximum Available | 965,000,000 |
| LOCs Issued | 895,000,000 |
| LOC facility, due October 2031 | |
| Line of Credit Facility [Line Items] | |
| Maximum Available | 827,000,000 |
| LOCs Issued | $ 827,000,000 |