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Borrowing and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Borrowings and Credit Agreements |  |
Total debt principal | $ 27,170 | $ 27,726
Debt premiums | 28 | 33
Debt discounts and deferred financing costs | (196) | (228)
Long-term debt, net of premiums, discounts and deferred costs | 27,002 | 27,531
Short-term debt (commercial paper) | (1,276) | (1,874)
Current portion of long-term debt | (3,545) | (42)
Long-term debt | 22,181 | 25,615
1.9% senior notes due 2018 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 2,250 | 2,250
Interest rate, stated percentage | 1.90% |
2.25% senior notes due 2018 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,250 | 1,250
Interest rate, stated percentage | 2.25% |
2.25% senior notes due 2019 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 850 | 850
Interest rate, stated percentage | 2.25% |
2.8% senior notes due 2020 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 2,750 | 2,750
Interest rate, stated percentage | 2.80% |
2.125% senior notes due 2021 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,750 | 1,750
Interest rate, stated percentage | 2.125% |
4.125% senior notes due 2021 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 550 | 550
Interest rate, stated percentage | 4.125% |
2.75% senior notes due 2022 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,250 | 1,250
Interest rate, stated percentage | 2.75% |
3.5% senior notes due 2022 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,500 | 1,500
Interest rate, stated percentage | 3.50% |
4.75% senior notes due 2022 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 399 | 399
Interest rate, stated percentage | 4.75% |
4% senior notes due 2023 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,250 | 1,250
Interest rate, stated percentage | 4.00% |
3.375% senior notes due 2024 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 650 | 650
Interest rate, stated percentage | 3.375% |
5% senior notes due 2024 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 299 | 299
Interest rate, stated percentage | 5.00% |
3.875% senior notes due 2025 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 2,828 | 2,828
Interest rate, stated percentage | 3.875% |
2.875% senior notes due 2026 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,750 | 1,750
Interest rate, stated percentage | 2.875% |
6.25% senior notes due 2027 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 372 | 372
Interest rate, stated percentage | 6.25% |
3.25% senior exchange debentures due 2035 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1 | 1
Interest rate, stated percentage | 3.25% |
4.875% senior notes due 2035 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 652 | 652
Interest rate, stated percentage | 4.875% |
6.125% senior notes due 2039 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 447 | 447
Interest rate, stated percentage | 6.125% |
5.75% senior notes due 2041 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 133 | 133
Interest rate, stated percentage | 5.75% |
5.3% senior notes due 2043 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 750 | 750
Interest rate, stated percentage | 5.30% |
5.125% senior notes due 2045 |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 3,500 | 3,500
Interest rate, stated percentage | 5.125% |
Capital lease obligation |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 670 | 648
Other |  |
Borrowings and Credit Agreements |  |
Total debt principal | 43 | 23
Commercial Paper |  |
Borrowings and Credit Agreements |  |
Total debt principal | $ 1,276 | $ 1,874

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