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Significant Accounting Policies (Details 2) (Services, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Multiple-Deliverable Arrangements
Aggregate deferred revenue	$ 7,281	$ 7,363
Unbilled services accounts receivable included in notes and accounts receivable trade	$ 1,998	$ 2,166
Unbilled services accounts receivable, length of time expected to be billed	4 months
Minimum
Multiple-Deliverable Arrangements
Services contract terms range	1 year
Maximum
Multiple-Deliverable Arrangements
Services contract terms range	10 years

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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