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	$ 24
Unrecognized net loss	6
Total	30
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	20
Unrecognized net loss	110
Total	$ 130

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.

+ References+ Details

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.

+ References+ Details