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Financial Instruments and Fair Value Measures (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Book values
Assets
Investments	$ 110	$ 107
Liabilities
Short-term borrowings	410	1,020
Current maturities of long-term debt and lease obligations	22	22
Long-term debt and lease obligations	14,326	14,630
Approximate fair values
Assets
Investments	112	104
Liabilities
Short-term borrowings	410	1,020
Current maturities of long-term debt and lease obligations	22	22
Long-term debt and lease obligations	$ 14,246	$ 15,066

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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