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Benefit Plans (Schedule of prior period service cost expected to be amortized from accumulated other comprehensive income (loss) into net periodic pension cost during next fiscal year) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Qualified [Member]
Prior service credit	$ 1
Net actuarial gain (loss)	(68)
Net amount to be amortized in 2012	(67)
Nonqualified [Member]
Prior service credit	0
Net actuarial gain (loss)	(5)
Net amount to be amortized in 2012	$ (5)

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.

+ References+ Details

- Definition

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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