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Short-Term and Long-Term Borrowings Short-Term and Long-Term Borrowings (Schedule of Long-Term Borrowings) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2008
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long term debt, current and non-current, before unamortized discount or premium |  | $ 8,137 |  | $ 8,777 |  |  |
Less short-term portion of long-term debt |  | 4 |  | 1,115 |  |  |
Long term debt, excluding current maturities, before unamortized discount or premium |  | 8,133 |  | 7,662 |  |  |
Less debt issuance costs |  | 35 |  | 32 |  |  |
Long-term debt, excluding current maturities |  | 8,098 |  | 7,630 |  |  |
Capital lease obligations |  | 9 |  | 12 |  |  |
Long-term borrowings and capital lease obligations |  | $ 8,107 |  | $ 7,642 |  |  |
Medium-term notes due 2038-2041 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 0.60% |  | 0.10% |  |  |
Medium-term Notes | [1] | $ 111 |  | $ 111 |  |  |
Senior Note 1 Point 95 Percent Due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.95% |  | 1.95% |  | 1.95% |
Senior Notes |  | $ 0 | [2] | $ 348 | [2] | $ 152 |
Senior Note 2 Point 75 Percent Due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.75% |  | 2.75% |  | 2.75% |
Senior Notes |  | $ 0 | [2] | $ 223 | [2] | $ 277 |
Senior Note 5 Point 25 Percent Due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.25% |  | 5.25% |  | 5.25% |
Senior Notes |  | $ 0 | [2] | $ 541 | [2] | $ 59 |
Senior Note 6 Percent Due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.00% |  | 6.00% |  |  |
Senior Notes | [3] | $ 1,290 |  | $ 1,314 |  |  |
Senior Note 5 Point 75 Percent Due 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.75% |  | 5.75% |  |  |
Senior Notes |  | $ 500 |  | $ 499 |  |  |
Senior Note 4 Point 625 Percent Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.625% |  | 4.625% |  |  |
Senior Notes |  | $ 999 |  | $ 998 |  |  |
Senior Note 3 Point 625 Percent Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.625% |  | 3.625% |  |  |
Senior Notes |  | $ 999 |  | $ 999 |  |  |
Senior Note 4 Point 25 Percent Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.25% |  | 4.25% |  |  |
Senior Notes |  | $ 499 |  | $ 499 |  |  |
Senior Note 2 Point 80 percent notes due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.80% |  | 2.80% |  |  |
Senior Notes |  | $ 1,250 |  | $ 1,250 |  |  |
Senior Note 6 Point 50 Percent Due 2028 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.50% |  | 6.50% |  |  |
Debenture notes |  | $ 299 |  | $ 299 |  |  |
Senior Note 5 Point 60 Percent Due 2036 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.60% |  | 5.60% |  |  |
Senior Notes |  | $ 396 |  | $ 396 |  |  |
Senior Note 4 Point 90 Percent Due 2041 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.90% |  | 4.90% |  |  |
Senior Notes |  | $ 494 |  | $ 494 |  |  |
Senior Note 4 Point 15 percent due 2043 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% |  | 4.15% |  |  |
Senior Notes |  | $ 749 |  | $ 749 |  |  |
Term Loan Facility due 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term line of credit, noncurrent |  | $ 500 |  | $ 0 |  |  |
Other Loans [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 4.30% |  | 4.30% |  |  |
Other Loans Payable | [2],[4] | $ 22 |  | $ 25 |  |  |
Other Loans, Various Currencies [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other Loans Payable | [2] | $ 29 |  | $ 32 |  |  |
Interest Rate Swap [Member] | Senior Note 6 Percent Due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective Yield On Interest Rate Swap |  |  |  |  |  |  | 3.85%
[1] | Average interest rates on medium-term notes were 0.6 percent and 0.1 percent at December 31, 2016 and 2015, respectively.
[2] | Includes long-term debt due within one year.
[3] | 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 percent.
[4] | Average interest rates on other loans were 4.3 percent at December 31, 2016 and 2015.

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