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Retirement Plans (Details 5) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Pension Plans, Defined Benefit [Member] |
Net actuarial gain: |
Reclassified to earnings from equity | $ (80)
Losses in current year | 102
Net actuarial gain, pretax | 22
Net prior service credit: |
Reclassification to earnings from equity | 1
Gains in current year | (10)
Net prior service credit, pretax | (9)
Total, pretax | $ 13

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