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Compensation and Benefit Plans (Plan Assets - Changes in Level 3 Fair Value) (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2013 Postretirement Benefits Other Than Pensions | Dec. 31, 2012 Postretirement Benefits Other Than Pensions | Dec. 31, 2011 Postretirement Benefits Other Than Pensions | Dec. 31, 2013 Postretirement Benefits Other Than Pensions Level 3 | Dec. 31, 2012 Postretirement Benefits Other Than Pensions Level 3 | Dec. 31, 2013 Pension Plans | Dec. 31, 2012 Pension Plans | Dec. 31, 2011 Pension Plans | Dec. 31, 2013 Pension Plans Level 3 | Dec. 31, 2012 Pension Plans Level 3
Change in plan assets |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ 2,065 | $ 1,800 | $ 1,570 | $ 166 | $ 130 | $ 3,477 | $ 3,542 | $ 3,153 | $ 414 | $ 448
Defined Benefit Plan, Actual Return on Plan Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Relating to assets still held at end of period |  |  |  | 24 | 20 |  |  |  | 61 | 88
Relating to assets sold during the period |  |  |  | 5 | 5 |  |  |  | 10 | 13
Purchases |  |  |  | 23 | 35 |  |  |  | 45 | 98
Dispositions |  |  |  | (54) | (24) |  |  |  | (140) | (233)
Transfers in and/or out of Level 3 |  |  |  | 0 | 0 |  |  |  | 0 | 0
Fair value of plan assets at end of year | $ 2,065 | $ 1,800 | $ 1,570 | $ 164 | $ 166 | $ 3,477 | $ 3,542 | $ 3,153 | $ 390 | $ 414

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- Definition Purchases of plan assets that occurred during the period. + References No definition available. + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + 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 (d)(iv)(02)(A) -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 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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 (d)(iv)(02)(A) -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 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary. + 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)(7) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + 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 Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs. + 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 (d)(iv)(02)(C) -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 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(C) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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