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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |
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Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Equipment and Buildings [Member] | Dec. 31, 2013 Minimum [Member] Computer Software, Intangible Asset [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Equipment and Buildings [Member] | Dec. 31, 2013 Maximum [Member] Computer Software, Intangible Asset [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Level 2 Inputs [Member] | Dec. 31, 2012 Level 2 Inputs [Member]
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of cash equivalents |  |  |  |  |  |  | $ 5,116 | $ 0 | $ 2,256 | $ 2,026
Held-to-maturity, marketable securities, maturity timing in months | 3 months |  |  | 12 months |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years | 5 years |  | 25 years | 7 years |  |  |  |
Definite-lived intangible assets, useful life | 1 year |  |  | 20 years |  |  |  |  |  |
Asset retirement obligations, useful life | 1 year |  |  | 25 years |  |  |  |  |  |

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- Definition Asset retirement obligations useful life + References No definition available. + Details
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- Definition Held-to-maturity, marketable securities, maturity timing + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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