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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 871 | $ 577 | $ 1,430 | $ 1,106
Tax expense, entities included in effective tax rate calculation | 1,200 | $ 793 | 2,000 | $ 1,300
Net deferred tax assets | $ 35,000 |  | $ 35,000 |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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