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Retirement Benefits (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amounts recorded in accumulated other comprehensive loss (Table Amounts)
Unamortized benefit plan costs	$ (5,316)	$ (3,000)
Pension Benefits
Amounts recorded in accumulated other comprehensive loss (Table Amounts)
Net actuarial loss	8,797	5,291
Prior service credit	364	423
Income tax benefits related to above items	(3,285)	(1,928)
Unamortized benefit plan costs	(5,148)	(2,940)
Medical and Life Benefits
Amounts recorded in accumulated other comprehensive loss (Table Amounts)
Net actuarial loss	372	151
Prior service credit	94	47
Income tax benefits related to above items	(110)	(44)
Unamortized benefit plan costs	$ (168)	$ (60)

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.

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