Shareholders' Equity (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Shareholders' Equity Activity Summarization [Line Items]
Beginning balance			$ 10,387	$ 8,757
Transactions with shareholders			181	96
Payments of dividends to shareholders			(165)	(163)
Ending balance	11,658	9,384	11,658	9,384
Comprehensive income:
Net income	741	483	1,252	690
Other comprehensive income	1	(3)	3	4
Total comprehensive income	742	480	1,255	694
Comprehensive income attributable to noncontrolling interest	2	3
Comprehensive income attributable to company	740	477
Accumulated other comprehensive loss
Defined benefit and other postretirement liability adjustments	(176)		(176)		(175)
Cumulative translation adjustments	(64)		(64)		(66)
Unrealized gains on investments	3		3		1
Total accumulated other comprehensive loss	(237)		(237)		(240)
Company shareholders' equity [Member]
Shareholders' Equity Activity Summarization [Line Items]
Beginning balance			10,373	8,728
Transactions with shareholders			181	98
Payments of dividends to shareholders			(165)	(163)
Ending balance	11,642	9,353	11,642	9,353
Comprehensive income:
Net income			1,250	686
Other comprehensive income			3	4
Total comprehensive income			1,253	690
Noncontrolling interest in consolidated subsidiaries [Member]
Shareholders' Equity Activity Summarization [Line Items]
Beginning balance			14	29
Transactions with shareholders			0	(2)
Payments of dividends to shareholders			0	0
Ending balance	16	31	16	31
Comprehensive income:
Net income			2	4
Other comprehensive income			0	0
Total comprehensive income			$ 2	$ 4

Accumulated change in equity from nonowner sources, net of tax (except for foreign currency translation items), at fiscal year-end. Excludes Net Income(Loss), and accumulated changes in equity from transactions with owners. Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities and changes in fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Accumulated appreciation or loss, net of tax, in value of the total of unsold securities at the end of an accounting period.

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The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains (losses).

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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 reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes 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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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 noncontrolling interests, if any. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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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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Dividend to be paid-in-kind declared for common shareholders by an entity during the period. This element includes paid and unpaid dividends declared during the period.

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This element represents Other Comprehensive Income (Loss), Net of Tax, for the period. Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.

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