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Long-Term Borrowings and Capital Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2008
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long term debt, current and non-current, before unamortized discount or premium |  | $ 8,777 |  |  | $ 10,664 |  |
Long term debt, current, before unamortized discount or premium |  | 1,115 |  |  | 1,405 |  |
Long term debt, excluding current maturities, before unamortized discount or premium |  | 7,662 |  |  | 9,259 |  |
Unamortized debt issuance costs |  | 32 |  |  | 38 |  |
Total long-term debt less current maturities |  | 7,630 |  |  | 9,221 |  |
Capital lease obligations |  | 12 |  |  | 12 |  |
Total long-term debt and capital lease obligations |  | 7,642 |  |  | 9,233 |  |
Medium-term notes due 2038-2041 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Medium-term notes | [1] | $ 111 |  |  | $ 114 |  |
Average interest rate |  | 0.10% |  |  | 0.00% |  |
3.25% notes due 2015 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 0 |  |  | $ 1,001 | [2],[3] |
Debt instrument, interest rate, stated percentage |  | 3.25% |  |  | 3.25% |  |
3.25% notes due 2015 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notional amount of interest rate swaps |  |  |  |  | $ 1,000 |  |
Fair value of interest rate swaps, asset |  |  |  |  | 1 |  |
4.75% notes due 2015 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 0 |  |  | $ 400 | [3] |
Debt instrument, interest rate, stated percentage |  | 4.75% |  |  | 4.75% |  |
1.95% notes due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 348 | [3] | $ 152 | $ 499 |  |
Debt instrument, interest rate, stated percentage |  | 1.95% |  | 1.95% | 1.95% |  |
2.75% notes due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 223 | [3] | $ 277 | $ 500 |  |
Debt instrument, interest rate, stated percentage |  | 2.75% |  | 2.75% | 2.75% |  |
5.25% notes due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 541 | [3] | $ 59 | $ 600 |  |
Debt instrument, interest rate, stated percentage |  | 5.25% |  | 5.25% | 5.25% |  |
6.00% notes due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes | [4] | $ 1,314 |  |  | $ 1,338 |  |
Debt instrument, interest rate, stated percentage |  | 6.00% |  |  | 6.00% |  |
6.00% notes due 2018 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective yield of interest rate swap |  |  |  |  |  |  | 3.85%
5.75% notes due 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 499 |  |  | $ 499 |  |
Debt instrument, interest rate, stated percentage |  | 5.75% |  |  | 5.75% |  |
4.625% notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 998 |  |  | $ 998 |  |
Debt instrument, interest rate, stated percentage |  | 4.625% |  |  | 4.625% |  |
3.625% notes due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 999 |  |  | $ 999 |  |
Debt instrument, interest rate, stated percentage |  | 3.625% |  |  | 3.625% |  |
4.25% notes due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 499 |  |  | $ 499 |  |
Debt instrument, interest rate, stated percentage |  | 4.25% |  |  | 4.25% |  |
2.80% notes due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 1,250 |  |  | $ 1,250 |  |
Debt instrument, interest rate, stated percentage |  | 2.80% |  |  | 2.80% |  |
6.50% debentures due 2028 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debenture notes |  | $ 299 |  |  | $ 299 |  |
Debt instrument, interest rate, stated percentage |  | 6.50% |  |  | 6.50% |  |
5.60% notes due 2036 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 396 |  |  | $ 396 |  |
Debt instrument, interest rate, stated percentage |  | 5.60% |  |  | 5.60% |  |
4.90% notes due 2041 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 494 |  |  | $ 494 |  |
Debt instrument, interest rate, stated percentage |  | 4.90% |  |  | 4.90% |  |
4.15% notes due 2043 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes |  | $ 749 |  |  | $ 749 |  |
Debt instrument, interest rate, stated percentage |  | 4.15% |  |  | 4.15% |  |
Other Loans [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other loans | [3],[5] | $ 25 |  |  | $ 29 |  |
Average interest rate |  | 4.30% |  |  | 4.20% |  |
Other Loans, Various Currencies [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other loans | [3] | $ 32 |  |  | $ 0 |  |
[1] | Average interest rates on medium-term notes were 0.1% and 0.0% at December 31, 2015 and 2014
[2] | At December 31, 2014, the company had outstanding interest rate swap agreements with gross notional amounts of $1,000 that matured in 2015. The fair value of outstanding swaps was an asset of $1 at December 31, 2014.
[3] | Includes long-term debt due within one year.
[4] | During 2008, the interest rate swap agreement associated with these notes was terminated. The gain will be amortized over the remaining life of the bond, resulting in an effective yield of 3.85%.
[5] | Average interest rates on other loans were 4.3% and 4.2% at December 31, 2015 and 2014, respectively.

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