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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017 |  | 2016
U.S. | $ | 1,739 |  |  | $ | 1,976 |  |  | $ | 1,466 |
Foreign | 767 |  |  | 185 |  |  | 172 |
Total Income Before Income Taxes | $ | 2,506 |  |  | $ | 2,161 |  |  | $ | 1,638 |
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,
| 2018 |  | 2017 |  | 2016
Current tax expense (benefit) |  |  |  |  |
Federal | $ | (22 | ) |  | $ | (137 | ) |  | $ | (148 | )
State | (45 | ) |  | (16 | ) |  | (28 | )
Foreign | 249 |  |  | 18 |  |  | 6 |
Total | 182 |  |  | (135 | ) |  | (170 | )
Deferred tax expense (benefit) |  |  |  |  |  |  |  |
Federal | 425 |  |  | 2,022 |  |  | 998 |
State | 55 |  |  | 4 |  |  | 51 |
Foreign | (75 | ) |  | 47 |  |  | 38 |
Total | 405 |  |  | 2,073 |  |  | 1,087 |
Total tax provision | $ | 587 |  |  | $ | 1,938 |  |  | $ | 917 |
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,
| 2018 |  | 2017 |  | 2016
Federal income tax | $ | 526 |  |  | 21.0 | % |  | $ | 756 |  |  | 35.0 | % |  | $ | 573 |  |  | 35.0 | %
Increase (decrease) as a result of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State deferred tax rate change | (7 | ) |  | (0.3 | )% |  | 10 |  |  | 0.5 | % |  | 11 |  |  | 0.7 | %
Taxes on foreign earnings, net of federal benefit | 131 |  |  | 5.2 | % |  | 42 |  |  | 1.9 | % |  | 28 |  |  | 1.7 | %
Net effects of noncontrolling interests | (65 | ) |  | (2.6 | )% |  | (14 | ) |  | (0.7 | )% |  | (4 | ) |  | (0.3 | )%
State income tax, net of federal benefit | 46 |  |  | 1.8 | % |  | 38 |  |  | 1.8 | % |  | 26 |  |  | 1.6 | %
Dividend received deduction | (31 | ) |  | (1.2 | )% |  | (56 | ) |  | (2.6 | )% |  | (48 | ) |  | (2.9 | )%
Adjustments to uncertain tax positions | (47 | ) |  | (1.9 | )% |  | (12 | ) |  | (0.6 | )% |  | (23 | ) |  | (1.4 | )%
Valuation allowance on investment and tax credits | 14 |  |  | 0.5 | % |  | 13 |  |  | 0.6 | % |  | 34 |  |  | 2.1 | %
Impact of the 2017 Tax Reform | — |  |  | — | % |  | 1,240 |  |  | 57.4 | % |  | — |  |  | — | %
Nondeductible goodwill | 58 |  |  | 2.3 | % |  | — |  |  | — | % |  | 301 |  |  | 18.5 | %
General business credit | (64 | ) |  | (2.6 | )% |  | (95 | ) |  | (4.4 | )% |  | — |  |  | — | %
Other | 26 |  |  | 1.2 | % |  | 16 |  |  | 0.8 | % |  | 19 |  |  | 1.1 | %
Total | $ | 587 |  |  | 23.4 | % |  | $ | 1,938 |  |  | 89.7 | % |  | $ | 917 |  |  | 56.1 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred tax assets and liabilities result from the following (in millions):
| December 31,
| 2018 |  | 2017
Deferred tax assets |  |  |
Employee benefits | $ | 238 |  |  | $ | 251 |
Accrued expenses | 76 |  |  | 73 |
Net operating loss, capital loss and tax credit carryforwards | 1,526 |  |  | 1,113 |
Derivative instruments and interest rate and currency swaps | 9 |  |  | 12 |
Debt fair value adjustment | 33 |  |  | 37 |
Investments | 177 |  |  | 968 |
Other | — |  |  | 6 |
Valuation allowances | (178 | ) |  | (171 | )
Total deferred tax assets | 1,881 |  |  | 2,289 |
Deferred tax liabilities |  |  |  |  |
Property, plant and equipment | 270 |  |  | 225 |
Other | 45 |  |  | 20 |
Total deferred tax liabilities | 315 |  |  | 245 |
Net deferred tax assets | $ | 1,566 |  |  | $ | 2,044 |
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,
| 2018 |  | 2017 |  | 2016
Balance at beginning of period | $ | 97 |  |  | $ | 122 |  |  | $ | 148 |
Additions based on current year tax positions | 3 |  |  | 3 |  |  | 3 |
Additions based on prior year tax positions | 7 |  |  | — |  |  | 7 |
Reductions based on prior year tax positions | — |  |  | — |  |  | (1 | )
Reductions based on settlements with taxing authority | (73 | ) |  | (22 | ) |  | (26 | )
Reductions due to lapse in statute of limitations | — |  |  | (2 | ) |  | (9 | )
Impact of the 2017 Tax Reform | — |  |  | (4 | ) |  | — |
Balance at end of period | $ | 34 |  |  | $ | 97 |  |  | $ | 122 |

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