For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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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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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Amount of employer's best estimate 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.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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

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Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
Benefit Plans (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to expense for defined contribution plans	$ 82,000,000	$ 80,000,000	$ 81,000,000
Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	2.00%
Corporate Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	33.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	55.00%
Composition of plan assets	55.00%
Equity Securities [Member] \| Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	5.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	45.00%
US Treasury And Foreign Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	7.00%
All other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	5.00%
Below grade investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	9.00%
Below grade investments [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Composition of plan assets	19.00%
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.90%	4.00%	5.00%
Accumulated benefit obligation	7,900,000,000	6,800,000,000
Projected benefit obligation		299,000,000
Accumulated benefit obligation		261,000,000
Fair Value of Plan Assets		66,000,000
Estimated net loss expected to be amortized from accumulated other comprehensive losses during 2015	237,000,000
Estimated prior service cost ( credit) expected to be amortized from accumulated other comprehensive losses during 2014	7,000,000
Projected benefit obligation	8,330,000,000	7,137,000,000	7,924,000,000
Employer contributions	15,000,000	393,000,000
Pension [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to its pension plan in 2015	20,000,000
Pension [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to its pension plan in 2015	50,000,000
Change in Mortality Assumptions for Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	401,000,000
Change in Assumptions for Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	110,000,000
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.80%	3.90%	4.90%
Estimated net loss expected to be amortized from accumulated other comprehensive losses during 2015	46,000,000
Estimated prior service cost ( credit) expected to be amortized from accumulated other comprehensive losses during 2014	(39,000,000)
Projected benefit obligation	2,613,000,000	2,317,000,000	2,663,000,000
Postretirement Benefit Plan [Member] \| Other Current Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 152,000,000	$ 162,000,000