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Employee Benefits Schedule of Expected Benefit Payments (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | $ 39
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 40
Defined Benefit Plan, Expected Future Benefit Payments in Year Three | 42
Defined Benefit Plan, Expected Future Benefit Payments in Year Four | 44
Defined Benefit Plan, Expected Future Benefit Payments in Year Five | 45
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | 251
Pension Plans, Defined Benefit [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | 32
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 33
Defined Benefit Plan, Expected Future Benefit Payments in Year Three | 35
Defined Benefit Plan, Expected Future Benefit Payments in Year Four | 37
Defined Benefit Plan, Expected Future Benefit Payments in Year Five | 38
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | 215
Other Postretirement Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Three | 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Four | 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Five | 5
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | 26
Non Qualified Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Three | 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Four | 2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five | 2
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | $ 10

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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