Pension Plans and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plans and Other Postretirement Benefits
Employer's contributions under defined contribution plans	$ 199	$ 187	$ 186
Other Postretirement Benefits
Defined benefit plan
Benefit obligation	16	17
Net periodic benefit cost	1	1	1
Actual plan asset allocations
Total Company contributions to multiemployer pension plans	50	47	46
Pension Plans
Defined benefit plan
Number of defined benefit plans	9
Benefit obligation	758	685
Fair value of plan assets	527	463
Actual return on plan assets	62	37
Net periodic benefit cost	31	49	36
Curtailment losses included in net periodic costs	2
Settlements losses included in net periodic costs		25	12
Weighted-average assumptions used to determine net periodic cost
Discount rate (as a percent)	4.00%	4.75%
Expected long-term rate of return on plan assets (as a percent)	7.25%	7.25%	7.25%
Target plan asset allocations
Equity securities target allocation (as a percent)	50.00%
Debt securities target allocation (as a percent)	50.00%
Actual plan asset allocations
Equity securities (as a percent)	50.00%	47.00%
Debt securities (as a percent)	48.00%	51.00%
Money market securities (as a percent)	2.00%	2.00%
Employer's contributions under defined benefit plans	36	92	65
Estimated future employer contributions in next fiscal year	33
Total Company contributions to multiemployer pension plans	$ 12	$ 11	$ 12
Pension Plans \| Level 1
Actual plan asset allocations
Actual plan assets (as a percent)	84.00%	82.00%
Pension Plans \| Level 2
Actual plan asset allocations
Actual plan assets (as a percent)	16.00%	18.00%
Tax-qualified funded pension plans
Defined benefit plan
Number of defined benefit plans	3
Unfunded nonqualified supplemental retirement plans
Defined benefit plan
Number of defined benefit plans	6
Number of defined benefit plans not frozen in prior periods	2

Represents the number of defined benefit plans covering all eligible employees of the entity.

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Represents the number of defined benefit plans which were not frozen in prior periods.

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No definition available.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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

-Publisher FASB

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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The percentage of the fair value of equity securities to the fair value of total plan assets held as of the measurement date.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.

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Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date.

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The amount of the cost recognized during the period for defined contribution plans.

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Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans.

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