Marketable Securities (current and non-current) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Marketable securities classification
Current marketable securities	$ 971	$ 1,648
Non-current marketable securities	1,547	1,162
Total marketable securities	2,518	2,810
U.S. government agency securities
Marketable securities classification
Current marketable securities	159	162
Non-current marketable securities	218	125
Foreign government agency securities
Marketable securities classification
Current marketable securities	26	16
Non-current marketable securities	105	51
Corporate debt securities
Marketable securities classification
Current marketable securities	173	471
Non-current marketable securities	559	494
Commercial paper
Marketable securities classification
Current marketable securities	60	116
Certificates of deposit/time deposits
Marketable securities classification
Current marketable securities	48	41
Non-current marketable securities	20	0
U.S. treasury securities
Marketable securities classification
Current marketable securities	40	54
Non-current marketable securities	49	18
U.S. municipal securities
Marketable securities classification
Current marketable securities	2	13
Non-current marketable securities	0	14
Asset-backed securities
Marketable securities classification
Current marketable securities	463	775
Non-current marketable securities	586	453
Asset-backed securities Automobile loan related
Marketable securities classification
Current marketable securities	394	567
Non-current marketable securities	344	375
Asset-backed securities Credit card related
Marketable securities classification
Current marketable securities	32	123
Non-current marketable securities	134	34
Asset-backed securities Equipment lease related
Marketable securities classification
Current marketable securities	18	54
Non-current marketable securities	67	36
Asset-backed securities Other asset-backed securities
Marketable securities classification
Current marketable securities	19	31
Non-current marketable securities	41	8
Auction rate securities
Marketable securities classification
Non-current marketable securities	$ 10	$ 7

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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