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Retirement Benefits (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Pension Benefits
Amounts expected to be recognized in 2013 net periodic benefit cost (Table Amounts)
Net actuarial loss	$ 608
Prior service credit	(58)
Medical and Life Benefits
Amounts expected to be recognized in 2013 net periodic benefit cost (Table Amounts)
Net actuarial loss	30
Prior service credit	$ (51)

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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