Postretirement Benefit Plans (Changes in Level 3 Investments) (Details) - Pension Benefit Plan [Member] - Changes In Level 3 Investments [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Beginning Balance	$ 11,245	$ 12,003
Actual gain (loss) on plan assets	666	540
Net unrealized gains (losses)	377	1,118
Purchases, issuances, and settlements	(1,962)	(2,172)
Transfers in and/or out of Level 1	274	(244)
Ending Balance	10,600	11,245
Assets Held [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Net unrealized gains (losses)	899	1,616
Assets Not Held [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Net unrealized gains (losses)	144	42
Private Equities [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Beginning Balance	6,269	6,878
Actual gain (loss) on plan assets	592	525
Net unrealized gains (losses)	(54)	588
Purchases, issuances, and settlements	(1,565)	(1,675)
Transfers in and/or out of Level 1	(25)	(47)
Ending Balance	5,217	6,269
Real Estate [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Beginning Balance	3,354	3,356
Actual gain (loss) on plan assets	36	23
Net unrealized gains (losses)	334	330
Purchases, issuances, and settlements	(595)	(355)
Transfers in and/or out of Level 1	0	0
Ending Balance	3,129	3,354
Other Investments [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Beginning Balance	1,622	1,694
Actual gain (loss) on plan assets	47	(1)
Net unrealized gains (losses)	86	200
Purchases, issuances, and settlements	194	(77)
Transfers in and/or out of Level 1	299	(194)
Ending Balance	2,248	1,622
Debt Securities [Member]
Defined Benefit Plan Transfers Between Measurement Levels [Line Items]
Beginning Balance	0	75
Actual gain (loss) on plan assets	(9)	(7)
Net unrealized gains (losses)	11	0
Purchases, issuances, and settlements	4	(65)
Transfers in and/or out of Level 1	0	(3)
Ending Balance	$ 6	$ 0

Defined Benefit Plan, Transfers Between Measurement Levels [Line Items]

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- Definition

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

-Name Accounting Standards Codification

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

-URI http://asc.fasb.org/extlink&oid=6504192

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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

-URI http://asc.fasb.org/extlink&oid=6504226

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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-Paragraph 1

-Subparagraph (b)

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- Definition

The amount of increase or decrease in the fair value of plan assets during the reporting period.

+ References

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Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(B)

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- Definition

Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(C)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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-Topic 715

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