Schedule of Defined Benefit Plans Disclosures [Text Block] |
| | | | | | | | | | | | | | | | | (dollars in millions) | Quoted Prices in Active Markets For Identical Assets (Level 1) |
| | Significant Observable Inputs (Level 2) |
| | Significant Unobservable Inputs (Level 3) |
| | Total |
| Asset Category: | | | | | | | | Public Equities | | | | | | | | Global Equities | $ | 6,840 |
| | $ | 1 |
| | $ | — |
| | $ | 6,841 |
| Global Equity Commingled Funds 1 | — |
| | 4,881 |
| | — |
| | 4,881 |
| Enhanced Global Equities 2 | 261 |
| | 2,241 |
| | 500 |
| | 3,002 |
| Private Equities 3 | — |
| | — |
| | 1,339 |
| | 1,339 |
| Fixed Income Securities |
| |
| |
| | | Governments | 424 |
| | 1,307 |
| | — |
| | 1,731 |
| Corporate Bonds | — |
| | 8,461 |
| | 296 |
| | 8,757 |
| Structured Products 4 | — |
| | 80 |
| | — |
| | 80 |
| Real Estate 5 | — |
| | 13 |
| | 1,800 |
| | 1,813 |
| Other 6 | — |
| | 2,110 |
| | — |
| | 2,110 |
| Cash & Cash Equivalents 7 | 2 |
| | 207 |
| | — |
| | 209 |
| Subtotal | $ | 7,527 |
| | $ | 19,301 |
| | $ | 3,935 |
| | 30,763 |
| Other Assets & Liabilities 8 | | | | | | | 592 |
| Total at December 31, 2013 | | | | | | | $ | 31,355 |
| Public Equities | | | | | | | | Global Equities | $ | 6,413 |
| | $ | — |
| | $ | — |
| | $ | 6,413 |
| Global Equity Commingled Funds 1 | — |
| | 4,114 |
| | — |
| | 4,114 |
| Enhanced Global Equities 2 | 169 |
| | 1,959 |
| | 447 |
| | 2,575 |
| Private Equities 3 | — |
| | — |
| | 1,202 |
| | 1,202 |
| Fixed Income Securities |
| |
| |
| | | Governments | 1,003 |
| | 1,421 |
| | — |
| | 2,424 |
| Corporate Bonds | — |
| | 7,699 |
| | 276 |
| | 7,975 |
| Structured Products 4 | — |
| | 21 |
| | — |
| | 21 |
| Real Estate 5 | — |
| | 19 |
| | 1,785 |
| | 1,804 |
| Other 6 | — |
| | 2,182 |
| | — |
| | 2,182 |
| Cash & Cash Equivalents 7 | 1 |
| | 364 |
| | — |
| | 365 |
| Subtotal | $ | 7,586 |
| | $ | 17,779 |
| | $ | 3,710 |
| | 29,075 |
| Other Assets & Liabilities 8 | | | | | | | 853 |
| Total at December 31, 2012 | | | | | | | $ | 29,928 |
|
| | | | | (dollars in millions) | | Net actuarial loss | $ | 430 |
| Prior service credit | (9 | ) | | $ | 421 |
|
| | | | | | | | | | | | | (dollars in millions) | 2013 | | 2012 | | 2011 | Other Postretirement Benefits: | | | | | | Service cost | $ | 3 |
| | $ | 3 |
| | $ | 3 |
| Interest cost | 38 |
| | 37 |
| | 39 |
| Expected return on plan assets | — |
| | — |
| | (1 | ) | Amortization of prior service credit | (10 | ) | | (4 | ) | | (2 | ) | Recognized actuarial net gain | (4 | ) | | (6 | ) | | (8 | ) | Net settlement and curtailment gain | — |
| | (2 | ) | | (8 | ) | Net periodic other postretirement benefit cost | $ | 27 |
| | $ | 28 |
| | $ | 23 |
|
| | | | | | | | | (dollars in millions) | 2013 | | 2012 | Change in Benefit Obligation: | | | | Beginning balance | $ | 1,106 |
| | $ | 784 |
| Service cost | 3 |
| | 3 |
| Interest cost | 38 |
| | 37 |
| Actuarial (gain) loss | (62 | ) | | 45 |
| Total benefits paid | (119 | ) | | (107 | ) | Business combinations | — |
| | 328 |
| Other | 21 |
| | 16 |
| Ending balance | $ | 987 |
| | $ | 1,106 |
| | | | | Change in Plan Assets: | | | | Beginning balance | $ | — |
| | $ | — |
| Actual return on plan assets | — |
| | — |
| Employer contributions | 95 |
| | 85 |
| Benefits paid from plan assets | (119 | ) | | (107 | ) | Other | 24 |
| | 22 |
| Ending balance | $ | — |
| | $ | — |
| | | | | Funded Status: | | | | Fair value of plan assets | $ | — |
| | $ | — |
| Benefit obligations | (987 | ) | | (1,106 | ) | Funded status of plan | $ | (987 | ) | | $ | (1,106 | ) | | | | | Amounts Recognized in the Consolidated Balance Sheet Consist of: | | | | Current liability | $ | (86 | ) | | $ | (91 | ) | Noncurrent liability | (901 | ) | | (1,015 | ) | Net amount recognized | $ | (987 | ) | | $ | (1,106 | ) | | | | | Amounts Recognized in Accumulated Other Comprehensive Loss Consist of: | | | | Net actuarial gain | $ | (124 | ) | | $ | (65 | ) | Prior service credit | (1 | ) | | (11 | ) | Net amount recognized | $ | (125 | ) | | $ | (76 | ) |
| | | | | | | | | (dollars in millions) | 2013 | | 2012 | Projected benefit obligation | $ | 22,142 |
| | $ | 32,278 |
| Accumulated benefit obligation | 21,475 |
| | 31,147 |
| Fair value of plan assets | 19,884 |
| | 25,889 |
|
| | | | | | | | | | | | | | | | | | | | | (dollars in millions) | Enhanced Global Equities |
| | Private Equities |
| | Corporate Bonds |
| | Real Estate |
| | Total |
| Balance, December 31, 2011 | $ | 239 |
| | $ | 1,159 |
| | $ | 110 |
| | $ | 1,364 |
| | $ | 2,872 |
| Plan assets acquired | 63 |
| | — |
| | — |
| | 79 |
| | 142 |
| Realized gains | 1 |
| | 174 |
| | 3 |
| | 6 |
| | 184 |
| Unrealized (losses) gains relating to instruments still held in the reporting period | 31 |
| | (14 | ) | | 51 |
| | 115 |
| | 183 |
| Purchases, sales, and settlements, net | 113 |
| | (117 | ) | | 112 |
| | 221 |
| | 329 |
| Balance, December 31, 2012 | 447 |
| | 1,202 |
| | 276 |
| | 1,785 |
| | 3,710 |
| Realized gains | — |
| | 195 |
| | — |
| | 20 |
| | 215 |
| Unrealized (losses) gains relating to instruments still held in the reporting period | 50 |
| | (9 | ) | | 2 |
| | 102 |
| | 145 |
| Purchases, sales, and settlements, net | 3 |
| | (49 | ) | | 18 |
| | (107 | ) | | (135 | ) | Balance, December 31, 2013 | $ | 500 |
| | $ | 1,339 |
| | $ | 296 |
| | $ | 1,800 |
| | $ | 3,935 |
|
| | | | | | | | | (dollars in millions) | 2013 | | 2012 | Change in Benefit Obligation: | | | | Beginning balance | $ | 35,708 |
| | $ | 27,167 |
| Service cost | 569 |
| | 500 |
| Interest cost | 1,373 |
| | 1,331 |
| Actuarial (gain) loss | (3,027 | ) | | 2,855 |
| Total benefits paid | (1,601 | ) | | (1,357 | ) | Net settlement and curtailment gain | (53 | ) | | (90 | ) | Plan amendments | 224 |
| | (195 | ) | Business combinations | — |
| | 5,235 |
| Other | (167 | ) | | 262 |
| Ending balance | $ | 33,026 |
| | $ | 35,708 |
| | | | | Change in Plan Assets: | | | | Beginning balance | $ | 29,928 |
| | $ | 23,542 |
| Actual return on plan assets | 3,019 |
| | 3,306 |
| Employer contributions | 236 |
| | 516 |
| Benefits paid from plan assets | (1,601 | ) | | (1,357 | ) | Business combinations | — |
| | 3,800 |
| Other | (227 | ) | | 121 |
| Ending balance | $ | 31,355 |
| | $ | 29,928 |
| | | | | Funded Status: | | | | Fair value of plan assets | $ | 31,355 |
| | $ | 29,928 |
| Benefit obligations | (33,026 | ) | | (35,708 | ) | Funded status of plan | $ | (1,671 | ) | | $ | (5,780 | ) | | | | | Amounts Recognized in the Consolidated Balance Sheet Consist of: | | | | Noncurrent assets | $ | 768 |
| | $ | 643 |
| Current liability | (74 | ) | | (105 | ) | Noncurrent liability | (2,365 | ) | | (6,318 | ) | Net amount recognized | $ | (1,671 | ) | | $ | (5,780 | ) | | | | | Amounts Recognized in Accumulated Other Comprehensive Loss Consist of: | | | | Net actuarial loss | $ | 5,261 |
| | $ | 10,215 |
| Prior service credit | (37 | ) | | (322 | ) | Net amount recognized | $ | 5,224 |
| | $ | 9,893 |
|
| | | | | (dollars in millions) | | Current year actuarial gain | $ | (62 | ) | Current year prior service credit | (1 | ) | Amortization of prior service credit | 10 |
| Amortization of actuarial net gain | 4 |
| Net settlements and curtailments | — |
| Total recognized in other comprehensive loss | $ | (49 | ) | Net recognized in net periodic other postretirement benefit cost and other comprehensive loss | $ | 22 |
|
| | | | | | | | | | | | | | | | | | | Benefit Obligation | | Net Cost | | | 2013 | | 2012 | | 2013 | | 2012 | | 2011 | Discount rate | | 4.7 | % | | 4.0 | % | | 4.0 | % | | 4.6 | % | | 5.4 | % | Salary scale | | 4.2 | % | | 4.2 | % | | 4.2 | % | | 4.3 | % | | 4.4 | % | Expected return on plan assets | | — |
| | — |
| | 7.7 | % | | 7.7 | % | | 7.9 | % |
| | | | | | | | | | 2013 One-Percentage-Point | (dollars in millions) | Increase |
| | Decrease |
| Effect on total service and interest cost | $ | 3 |
| | $ | (2 | ) | Effect on postretirement benefit obligation | 69 |
| | (59 | ) |
| | | | | | | | | | | | | (dollars in millions) | 2013 | | 2012 | | 2011 | Pension Benefits: | | | | | | Service cost | $ | 569 |
| | $ | 500 |
| | $ | 444 |
| Interest cost | 1,373 |
| | 1,331 |
| | 1,298 |
| Expected return on plan assets | (2,107 | ) | | (1,944 | ) | | (1,834 | ) | Amortization of prior service credits | (34 | ) | | (24 | ) | | (12 | ) | Amortization of unrecognized net transition obligation | — |
| | 1 |
| | 1 |
| Recognized actuarial net loss | 954 |
| | 722 |
| | 462 |
| Net settlement and curtailment loss | 1 |
| | 77 |
| | 16 |
| Net periodic pension cost - employer | $ | 756 |
| | $ | 663 |
| | $ | 375 |
|
| | | | | | | | | | | | | | | | | Benefit Obligation | | Net Cost | | 2013 | | 2012 | | 2013 | | 2012 | | 2011 | Discount rate | 4.4 | % | | 3.6 | % | | 3.6 | % | | 4.2 | % | | 4.9 | % | Expected return on plan assets | — |
| | — |
| | — |
| | — |
| | 5.0 | % |
| | | | | | | | 2013 | | 2012 | Health care cost trend rate assumed for next year | 7.5 | % | | 8.0 | % | Rate that the cost trend rate gradually declines to | 5.0 | % | | 5.0 | % | Year that the rate reaches the rate it is assumed to remain at | 2019 |
| | 2019 |
|
| | | | | (dollars in millions) | | Current year actuarial gain | $ | (3,925 | ) | Amortization of actuarial loss | (954 | ) | Current year prior service cost | 226 |
| Amortization of prior service credit | 34 |
| Other | (50 | ) | Total recognized in other comprehensive loss | $ | (4,669 | ) | Net recognized in net periodic pension cost and other comprehensive loss | $ | (3,913 | ) |
|