Retirement Benefits (Details 3) (USD $) In Millions	Dec. 31, 2010	Dec. 31, 2009
Amounts Recorded in Accumulated Other Comprehensive Loss (Table Amounts) [Abstract]
Unamortized benefit plan costs	$ (2,762)	$ (3,059)
Pension Benefits
Amounts Recorded in Accumulated Other Comprehensive Loss (Table Amounts) [Abstract]
Net actuarial loss	(4,246)	(4,648)
Prior service (cost) credit	(194)	(242)
Unamortized benefit plan costs	(2,688)	(2,967)
Income tax benefits related to above items	1,752	1,923
Medical and Life Benefits
Amounts Recorded in Accumulated Other Comprehensive Loss (Table Amounts) [Abstract]
Net actuarial loss	(361)	(451)
Prior service (cost) credit	238	298
Unamortized benefit plan costs	(74)	(92)
Income tax benefits related to above items	$ 49	$ 61

Tax benefit (expense) on the unamortized total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, associated with defined benefit pension or other postretirement plans.

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- Definition

For prior service costs, the amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. For net transition assets, the original amount of transition assets as of the date FAS 87 or 106 was initially applied, (a) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost in excess of (b) the benefit obligation, the portion of which has yet to be recognized as components of net periodic benefit cost. For net transition obligations, the original amount of transition obligations as of the date FAS 87 or 106 was initially applied, (a) the benefit obligation in excess of (b) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost, the portion of which has yet to be recognized as components of net periodic benefit cost. All amounts are pretax.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c

+ Details

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c

+ Details

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