| Long-Term Debt |
We provide detail on our long-term debt balances in the following table as of the end of the 2015 first quarter and year-end 2014: | | | | | | | | | | At Period End | ($ in millions) | March 31,
2015 | | December 31,
2014 | Senior Notes: | | | | Series G, interest rate of 5.8%, face amount of $316, maturing November 10, 2015 (effective interest rate of 6.8%) | $ | 315 |
| | $ | 314 |
| Series H, interest rate of 6.2%, face amount of $289, maturing June 15, 2016 (effective interest rate of 6.3%) | 289 |
| | 289 |
| Series I, interest rate of 6.4%, face amount of $293, maturing June 15, 2017 (effective interest rate of 6.5%) | 293 |
| | 293 |
| Series K, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%) | 597 |
| | 596 |
| Series L, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%) | 349 |
| | 349 |
| Series M, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%) | 348 |
| | 348 |
| Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%) | 397 |
| | 397 |
| Commercial paper, average interest rate of 0.5% at March 31, 2015 | 1,320 |
| | 1,072 |
| $2,000 Credit Facility | — |
| | — |
| Other | 120 |
| | 123 |
| | 4,028 |
| | 3,781 |
| Less current portion classified in: | | | | Current portion of long-term debt | (325 | ) | | (324 | ) | | $ | 3,703 |
| | $ | 3,457 |
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