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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | The components of “Income Before Income Taxes” are as follows (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
U.S. | $ | 1,976 |  |  | $ | 1,466 |  |  | $ | 611 |
Foreign | 185 |  |  | 172 |  |  | 161 |
Total Income Before Income Taxes | $ | 2,161 |  |  | $ | 1,638 |  |  | $ | 772 |
Schedule of Components of Income Tax Expense (Benefit) | Components of the income tax provision applicable for federal, foreign and state taxes are as follows (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Current tax expense (benefit) |  |  |  |  |
Federal | $ | (137 | ) |  | $ | (148 | ) |  | $ | (125 | )
State | (16 | ) |  | (28 | ) |  | (7 | )
Foreign | 18 |  |  | 6 |  |  | 4 |
Total | (135 | ) |  | (170 | ) |  | (128 | )
Deferred tax expense (benefit) |  |  |  |  |  |  |  |
Federal | 2,022 |  |  | 998 |  |  | 653 |
State | 4 |  |  | 51 |  |  | (4 | )
Foreign | 47 |  |  | 38 |  |  | 43 |
Total | 2,073 |  |  | 1,087 |  |  | 692 |
Total tax provision | $ | 1,938 |  |  | $ | 917 |  |  | $ | 564 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The difference between the statutory federal income tax rate and our effective income tax rate is summarized as follows (in millions, except percentages):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Federal income tax | $ | 756 |  |  | 35.0 | % |  | $ | 573 |  |  | 35.0 | % |  | $ | 271 |  |  | 35.0 | %
Increase (decrease) as a result of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State deferred tax rate change | 10 |  |  | 0.5 | % |  | 11 |  |  | 0.7 | % |  | (24 | ) |  | (3.1 | )%
Taxes on foreign earnings, net of federal benefit | 42 |  |  | 1.9 | % |  | 28 |  |  | 1.7 | % |  | 26 |  |  | 3.5 | %
Net effects of noncontrolling interests | (14 | ) |  | (0.7 | )% |  | (4 | ) |  | (0.3 | )% |  | 15 |  |  | 2.0 | %
State income tax, net of federal benefit | 38 |  |  | 1.8 | % |  | 26 |  |  | 1.6 | % |  | 12 |  |  | 1.5 | %
Dividend received deduction | (56 | ) |  | (2.6 | )% |  | (48 | ) |  | (2.9 | )% |  | (51 | ) |  | (6.6 | )%
Adjustments to uncertain tax positions | (12 | ) |  | (0.6 | )% |  | (23 | ) |  | (1.4 | )% |  | (14 | ) |  | (1.9 | )%
Valuation allowance on investment and tax credits | 13 |  |  | 0.6 | % |  | 34 |  |  | 2.1 | % |  | — |  |  | — | %
Impact of the 2017 Tax Reform | 1,240 |  |  | 57.4 | % |  | — |  |  | — | % |  | — |  |  | — | %
Nondeductible goodwill | — |  |  | — | % |  | 301 |  |  | 18.5 | % |  | 323 |  |  | 41.7 | %
General business credit | (95 | ) |  | (4.4 | )% |  | — |  |  | — | % |  | — |  |  | — | %
Other | 16 |  |  | 0.8 | % |  | 19 |  |  | 1.1 | % |  | 6 |  |  | 0.8 | %
Total | $ | 1,938 |  |  | 89.7 | % |  | $ | 917 |  |  | 56.1 | % |  | $ | 564 |  |  | 72.9 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred tax assets and liabilities result from the following (in millions):
| December 31,
| 2017 |  | 2016
Deferred tax assets |  |  |
Employee benefits | $ | 251 |  |  | $ | 401 |
Accrued expenses | 73 |  |  | 118 |
Net operating loss, capital loss and tax credit carryforwards | 1,113 |  |  | 1,307 |
Derivative instruments and interest rate and currency swaps | 12 |  |  | 22 |
Debt fair value adjustment | 37 |  |  | 74 |
Investments | 968 |  |  | 2,804 |
Other | 6 |  |  | 14 |
Valuation allowances | (171 | ) |  | (184 | )
Total deferred tax assets | 2,289 |  |  | 4,556 |
Deferred tax liabilities |  |  |  |  |
Property, plant and equipment | 225 |  |  | 177 |
Other | 20 |  |  | 27 |
Total deferred tax liabilities | 245 |  |  | 204 |
Net deferred tax assets | $ | 2,044 |  |  | $ | 4,352 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of our gross unrecognized tax benefit excluding interest and penalties is as follows (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Balance at beginning of period | $ | 122 |  |  | $ | 148 |  |  | $ | 189 |
Additions based on current year tax positions | 3 |  |  | 3 |  |  | 4 |
Additions based on prior year tax positions | — |  |  | 7 |  |  | — |
Reductions based on prior year tax positions | — |  |  | (1 | ) |  | (6 | )
Reductions based on settlements with taxing authority | (22 | ) |  | (26 | ) |  | (25 | )
Reductions due to lapse in statute of limitations | (2 | ) |  | (9 | ) |  | (14 | )
Impact of the 2017 Tax Reform | (4 | ) |  | — |  |  | — |
Balance at end of period | $ | 97 |  |  | $ | 122 |  |  | $ | 148 |

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