Employee Benefit Plans (Estimated Amortized Net Periodic Benefit For 2012) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	$ 25
Unrecognized net loss	6
Unrecognized net transition obligation	24
Total	55
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	19
Unrecognized net loss	125
Total	$ 144

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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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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- Definition

The amounts in accumulated other comprehensive income related to transition assets (obligations), origination from the adoption of FAS 87 and 106, 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 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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