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Employee Benefits Schedule of Changes in Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 Private Equity Funds [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] alternative assets [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] alternative assets [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] | Dec. 31, 2012 alternative assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 596 | $ 537 |  | $ 31 | $ 32 | $ 0 | $ 30 | $ 32 | $ 62 | $ 32 | $ 32 |
Unrealized gain on assets | 4 |  | 2 |  |  |  |  | (4) |  |  |  | (6)
Available-for-sale Securities, Gross Realized Gain (Loss) | (2) |  | (1) |  |  |  |  | 5 |  |  |  | 6
Purchases and sales, net | $ (3) |  | $ (1) |  |  |  |  | $ (31) |  |  |  | $ (30)

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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