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Income Taxes (Tax Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Insurance and employee benefits | $ 2,382 | $ 2,650
Other asset basis differences | 1,098 | 1,199
Other liability basis differences | 1,403 | 1,543
Tax loss carryforwards | 494 | 528
Tax credit carryforwards | 873 | 872
Valuation allowances | 545 | 591
Future Income Tax Benefits | 5,705 | 6,201
Other Asset Basis Differences | 5,376 | 5,324
Other items, net | 364 | 531
Future Income Taxes Payable | 5,740 | $ 5,855
Tax Credit Carryforwards | 873 |
Tax Loss Carryforwards | 2,647 |
Expiration Period Current To Five Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 12 |
Tax Loss Carryforwards | 317 |
Expiration Period Six To Ten Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 13 |
Tax Loss Carryforwards | 187 |
Expiration Period Eleven To Twenty Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 219 |
Tax Loss Carryforwards | 363 |
Expiration Period Indefinite [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 629 |
Tax Loss Carryforwards | $ 1,780 |

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