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Income Taxes (Tax Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Insurance and employee benefits | $ 928 | $ 2,382
Other asset basis differences | 798 | 1,098
Other liability basis differences | 1,158 | 1,403
Tax loss carryforwards | 544 | 494
Tax credit carryforwards | 948 | 873
Valuation allowances | 582 | 545
Future Income Tax Benefits | 3,794 | 5,705
Other Asset Basis Differences | 3,415 | 5,376
Other items, net | 411 | 364
Future Income Taxes Payable | 3,826 | $ 5,740
Tax Credit Carryforwards | 948 |
Tax Loss Carryforwards | 2,826 |
Expiration Period Current To Five Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 22 |
Tax Loss Carryforwards | 307 |
Expiration Period Six To Ten Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 33 |
Tax Loss Carryforwards | 218 |
Expiration Period Eleven To Twenty Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 269 |
Tax Loss Carryforwards | 359 |
Expiration Period Indefinite [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 624 |
Tax Loss Carryforwards | $ 1,942 |

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details
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