Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			$ 15,790	$ 13,216
Share repurchased			(1,050)
Payments of dividends to shareholders			(231)	(167)
Stock plans			244	154
Other			(27)	(23)
Comprehensive income (loss)	649	744	639	1,381
Balance at end of period	15,365	14,561	15,365	14,561
Company shareholders' equity
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			15,765	13,198
Share repurchased			(1,050)
Payments of dividends to shareholders			(231)	(167)
Stock plans			244	154
Other			(24)	(21)
Comprehensive income (loss)			633	1,376
Balance at end of period	15,337	14,540	15,337	14,540
Noncontrolling interest in consolidated subsidiaries
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			25	18
Share repurchased			0
Payments of dividends to shareholders			0	0
Stock plans			0	0
Other			(3)	(2)
Comprehensive income (loss)			6	5
Balance at end of period	$ 28	$ 21	$ 28	$ 21

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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