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Income Taxes (Tax Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Insurance and employee benefits | $ 1,205 | $ 1,154
Other asset basis differences | 829 | 1,013
Other liability basis differences | 2,153 | 1,482
Tax loss carryforwards | 622 | 583
Tax credit carryforwards | 1,021 | 1,050
Valuation allowances | 616 | 605
Future Income Tax Benefits | 5,214 | 4,677
Deferred Tax Liabilities Intangible Assets | 4,293 | 4,462
Other Asset Basis Differences | 2,904 | 2,159
Other items, net | 143 | 123
Future Income Taxes Payable | 7,340 | $ 6,744
Tax Credit Carryforwards | 1,021 |
Tax Loss Carryforwards | 3,184 |
Expiration Period Current To Five Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 59 |
Tax Loss Carryforwards | 393 |
Expiration Period Six To Ten Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 27 |
Tax Loss Carryforwards | 179 |
Expiration Period Eleven To Twenty Years [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 336 |
Tax Loss Carryforwards | 394 |
Expiration Period Indefinite [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax Credit Carryforwards | 599 |
Tax Loss Carryforwards | $ 2,218 |

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