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Income Taxes (Schedule of Earnings Before Income Taxes and Provision for Income Taxes) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
United States | $ 7,763 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 6,929 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 6,461 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Outside United States | 11 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 13 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 16 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Earnings (loss) before income taxes | 7,774 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,942 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 6,477 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Current: |  |  |
Federal - Current | 2,350 us-gaap_CurrentFederalTaxExpenseBenefit | 2,066 us-gaap_CurrentFederalTaxExpenseBenefit | 2,870 us-gaap_CurrentFederalTaxExpenseBenefit
State and local - Current | 480 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 423 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 348 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Outside United States - Current | 3 us-gaap_CurrentForeignTaxExpenseBenefit | 4 us-gaap_CurrentForeignTaxExpenseBenefit | 5 us-gaap_CurrentForeignTaxExpenseBenefit
Total current provision for income taxes | 2,833 us-gaap_CurrentIncomeTaxExpenseBenefit | 2,493 us-gaap_CurrentIncomeTaxExpenseBenefit | 3,223 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |
Federal - Deferred | (124)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (77)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (920)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local - Deferred | (5)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (9)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (9)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred provision for income taxes | (129)us-gaap_DeferredIncomeTaxExpenseBenefit | (86)us-gaap_DeferredIncomeTaxExpenseBenefit | (929)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for income taxes | $ 2,704 us-gaap_IncomeTaxExpenseBenefit | $ 2,407 us-gaap_IncomeTaxExpenseBenefit | $ 2,294 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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