Retirement Plans (Amounts Deferred In AOCI On The Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Compensation And Retirement Disclosure Line Items
Prior service (credit) cost	$ (214)	$ (258)
Net actuarial loss	5,737	4,790
Other Postretirement Benefit Plans, Defined Benefit
Compensation And Retirement Disclosure Line Items
Prior service (credit) cost	21	30
Net actuarial loss	401	234
Future Retirement Benefit Cost In 2013 \| Pension Benefits
Compensation And Retirement Disclosure Line Items
Prior service (credit) cost	(43)
Net actuarial loss	425
Future Retirement Benefit Cost In 2013 \| Other Postretirement Benefit Plans, Defined Benefit
Compensation And Retirement Disclosure Line Items
Prior service (credit) cost	6
Net actuarial loss	$ 25

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+ Details

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.

+ References

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+ Details