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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2019
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)201920182017
United States$1,594 $635 $607 
Foreign2,558 1,869 1,915 
$4,152 $2,504 $2,522 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] The income tax expense (benefit) for the years ended December 31, 2019, 2018 and 2017 consisted of the following components:
(dollars in millions)201920182017
Current:
United States:
Federal$(100)$(68)$709 
State(58)1 (42)
Foreign541 402 284 
383 335 951 
Future:
United States:
Federal121 45 (48)
State56 58 85 
Foreign(139)660 66 
 38 763 103 
Income tax expense$421 $1,098 $1,054 
Attributable to items credited (charged) to equity$40 $501 $(128)
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:
201920182017
Statutory U.S. federal income tax rate21.0 %21.0 %35.0 %
Tax on international activities(3.1)%(5.1)%(15.3)%
Tax audit settlements(7.0)%— %(2.2)%
U.S. tax reform— %29.7 %27.4 %
Other(0.8)%(1.8)%(3.1)%
Effective income tax rate10.1 %43.8 %41.8 %
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, 2019 and 2018 are as follows:
(dollars in millions)20192018
Future income tax benefits:
Insurance and employee benefits$1,205 $1,154 
Other asset basis differences829 1,013 
Other liability basis differences2,153 1,482 
Tax loss carryforwards622 583 
Tax credit carryforwards1,021 1,050 
Valuation allowances(616)(605)
$5,214 $4,677 
Future income taxes payable:
Intangible assets$4,293 $4,462 
Other asset basis differences 2,904 2,159 
Other items, net143 123 
$7,340 $6,744 
Summary Of Tax Credit Carryforwards [Table Text Block] At December 31, 2019, 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:
2020-2024$59 $393 
2025-202927 179 
2030-2039336 394 
Indefinite599 2,218 
Total$1,021 $3,184 
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, 2019, 2018 and 2017 is as follows: 
(dollars in millions)201920182017
Balance at January 1$1,619 $1,189 $1,086 
Additions for tax positions related to the current year131 192 192 
Additions for tax positions of prior years73 344 73 
Reductions for tax positions of prior years(101)(91)(91)
Settlements(375)(15)(71)
Balance at December 31$1,347 $1,619 $1,189 
Gross interest expense related to unrecognized tax benefits$57 $37 $34 
Total accrued interest balance at December 31$249 $255 $215