Consolidating Financial Information (Details 2) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 291	$ 263	$ 539	$ 495
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization			19	18
Pension, health and life insurance contributions			(18)	(18)
Pension, health and life insurance benefits expense			15	16
Deferred income taxes			(5)	13
Share-based compensation			7	5
Excess tax benefits from share-based payment arrangements			(3)
Changes in operating assets and liabilities:
Accounts and other receivables			(2)	(13)
Inventories			(42)	(36)
Accounts payable and accrued liabilities			113	9
Settlement costs			(326)	(332)
Income taxes			(35)	(77)
Other assets			1	5
Net cash provided by (used in) operating activities			263	85
Cash flows from investing activities:
Additions to plant and equipment			(26)	(18)
Net cash used in investing activities			(26)	(18)
Cash flows from financing activities:
Issuance of long-term debt				1,000
Shares repurchased			(783)	(340)
Dividends paid			(373)	(307)
Debt issuance costs				(13)
Proceeds from exercise of stock options			7
Excess tax benefits from share-based arrangements			3
Net cash provided by (used in) financing activities			(1,146)	340
Change in cash and cash equivalents			(909)	407
Cash and cash equivalents, beginning of year			2,063	1,384
Cash and cash equivalents, end of period	1,154	1,791	1,154	1,791
Parent [Member]
Cash flows from operating activities:
Net income	291	263	539	495
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity income from subsidiaries	(291)	(263)	(539)	(495)
Changes in operating assets and liabilities:
Accounts and other receivables			1
Accounts payable and accrued liabilities			23	(18)
Return on investment in subsidiaries			1,275	558
Net cash provided by (used in) operating activities			1,299	540
Cash flows from financing activities:
Shares repurchased			(783)	(340)
Dividends paid			(373)	(307)
Net cash provided by (used in) financing activities			(1,156)	(647)
Change in cash and cash equivalents			143	(107)
Cash and cash equivalents, beginning of year			163	130
Cash and cash equivalents, end of period	306	23	306	23
Issuer [Member]
Cash flows from operating activities:
Net income	291	263	539	495
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity income from subsidiaries	(173)	(169)	(329)	(283)
Depreciation and amortization			19	18
Pension, health and life insurance contributions			(18)	(18)
Pension, health and life insurance benefits expense			15	16
Deferred income taxes			(6)	13
Share-based compensation			7	5
Excess tax benefits from share-based payment arrangements			(3)
Changes in operating assets and liabilities:
Accounts and other receivables			(3)	(6)
Inventories			(42)	(36)
Accounts payable and accrued liabilities			122	67
Settlement costs			(326)	(332)
Income taxes			(38)	(80)
Other assets			1	3
Return on investment in subsidiaries			549	400
Net cash provided by (used in) operating activities			487	262
Cash flows from investing activities:
Additions to plant and equipment			(26)	(18)
Net cash used in investing activities			(26)	(18)
Cash flows from financing activities:
Issuance of long-term debt				1,000
Dividends paid			(1,275)	(558)
Debt issuance costs				(13)
Proceeds from exercise of stock options			7
Excess tax benefits from share-based arrangements			3
Net cash provided by (used in) financing activities			(1,265)	429
Change in cash and cash equivalents			(804)	673
Cash and cash equivalents, beginning of year			1,181	719
Cash and cash equivalents, end of period	377	1,392	377	1,392
All Other Subsidiaries [Member]
Cash flows from operating activities:
Net income	173	169	329	283
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income taxes			1
Changes in operating assets and liabilities:
Accounts and other receivables				(7)
Accounts payable and accrued liabilities			(32)	(40)
Income taxes			3	3
Other assets				2
Net cash provided by (used in) operating activities			301	241
Cash flows from financing activities:
Dividends paid			(549)	(400)
Net cash provided by (used in) financing activities			(549)	(400)
Change in cash and cash equivalents			(248)	(159)
Cash and cash equivalents, beginning of year			719	535
Cash and cash equivalents, end of period	471	376	471	376
Total Consolidating Adjustments [Member]
Cash flows from operating activities:
Net income	(464)	(432)	(868)	(778)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity income from subsidiaries	464	432	868	778
Changes in operating assets and liabilities:
Return on investment in subsidiaries			(1,824)	(958)
Net cash provided by (used in) operating activities			(1,824)	(958)
Cash flows from financing activities:
Dividends paid			1,824	958
Net cash provided by (used in) financing activities			1,824	958
Cash and cash equivalents, beginning of year			0	0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0	$ 0

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified equity-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element reduces net cash provided by operating activities.

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The net cash inflow or outflow from financing activity for the period.

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- Definition

The net cash inflow or outflow from investing activity.

+ References

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- Definition

The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

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- Definition

The cash outflow to reacquire common stock during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-Name Accounting Standards Codification
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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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-Paragraph 15
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The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

+ References

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 13
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 25
-Subparagraph (g)
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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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