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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract] |
Schedule of Income before Income Tax Domestic and Foreign [Table Text Block] | The sources of income from continuing operations before income taxes are:
(dollars in millions) | 2017 |  | 2016 |  | 2015
United States | $ | 2,990 |  |  | $ | 2,534 |  |  | $ | 2,782 |
Foreign | 4,773 |  |  | 4,599 |  |  | 3,685 |
| $ | 7,763 |  |  | $ | 7,133 |  |  | $ | 6,467 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 consisted of the following components:
(dollars in millions) | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
United States: |  |  |  |  |
Federal | $ | 1,577 |  |  | $ | 30 |  |  | $ | 328 |
State | 64 |  |  | (21 | ) |  | (37 | )
Foreign | 1,140 |  |  | 1,290 |  |  | 1,158 |
| 2,781 |  |  | 1,299 |  |  | 1,449 |
Future: |  |  |  |  |
United States: |  |  |  |  |
Federal | (27 | ) |  | 318 |  |  | 712 |
State | 84 |  |  | 134 |  |  | 109 |
Foreign | 5 |  |  | (54 | ) |  | (159 | )
| 62 |  |  | 398 |  |  | 662 |
Income tax expense | $ | 2,843 |  |  | $ | 1,697 |  |  | $ | 2,111 |
Attributable to items credited (charged) to equity | $ | (128 | ) |  | $ | (299 | ) |  | $ | (114 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Differences between effective income tax rates and the statutory U.S. federal income tax rate are as follows:
| 2017 |  | 2016 |  | 2015
Statutory U.S. federal income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Tax on international activities | (6.4 | )% |  | (8.1 | )% |  | (2.0 | )%
Tax audit settlements | (0.7 | )% |  | (2.9 | )% |  | — |
U.S. tax reform | 8.9 | % |  | — |  |  | — |
Other | (0.2 | )% |  | (0.2 | )% |  | (0.4 | )%
Effective income tax rate | 36.6 | % |  | 23.8 | % |  | 32.6 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The tax effects of temporary differences and tax carryforwards which gave rise to future income tax benefits and payables at December 31, 2017 and 2016 are as follows:
(dollars in millions) | 2017 |  | 2016
Future income tax benefits: |  |  |
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 | )
| $ | 3,794 |  |  | $ | 5,705 |
Future income taxes payable: |  |  |
Other asset basis differences | $ | 3,415 |  |  | $ | 5,376 |
Other items, net | 411 |  |  | 364 |
| $ | 3,826 |  |  | $ | 5,740 |
Summary Of Tax Credit Carryforwards [Table Text Block] | At December 31, 2017, tax credit carryforwards, principally state and foreign, and tax loss carryforwards, principally state and foreign, were as follows:
(dollars in millions) | Tax Credit Carryforwards |  |  | Tax Loss Carryforwards |
Expiration period: |  |  |
2018-2022 | $ | 22 |  |  | $ | 307 |
2023-2027 | 33 |  |  | 218 |
2028-2037 | 269 |  |  | 359 |
Indefinite | 624 |  |  | 1,942 |
Total | $ | 948 |  |  | $ | 2,826 |
Summary Of Income Tax Contingencies [Table Text Block] | A reconciliation of the beginning and ending amounts of unrecognized tax benefits and interest expense related to unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 is as follows:
(dollars in millions) | 2017 |  | 2016 |  | 2015
Balance at January 1 | $ | 1,086 |  |  | $ | 1,169 |  |  | $ | 1,089 |
Additions for tax positions related to the current year | 192 |  |  | 69 |  |  | 206 |
Additions for tax positions of prior years | 73 |  |  | 167 |  |  | 99 |
Reductions for tax positions of prior years | (91 | ) |  | (61 | ) |  | (101 | )
Settlements | (71 | ) |  | (258 | ) |  | (124 | )
Balance at December 31 | $ | 1,189 |  |  | $ | 1,086 |  |  | $ | 1,169 |
Gross interest expense related to unrecognized tax benefits | $ | 34 |  |  | $ | 41 |  |  | $ | 39 |
Total accrued interest balance at December 31 | $ | 215 |  |  | $ | 185 |  |  | $ | 176 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + 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=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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