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Income Taxes Income Tax Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Results of Operations, Income before Income Taxes [Abstract] |  |  |
U.S. | $ 1,976 | $ 1,466 | $ 611
Foreign | 185 | 172 | 161
Total Income Before Income Taxes | 2,161 | 1,638 | 772
Current tax expense (benefit) [Abstract] |  |  |
Federal | (137) | (148) | (125)
State | (16) | (28) | (7)
Foreign | 18 | 6 | 4
Total | (135) | (170) | (128)
Deferred tax expense (benefit) [Abstract] |  |  |
Federal | 2,022 | 998 | 653
State | 4 | 51 | (4)
Deferred Foreign Income Tax Expense (Benefit) | 47 | 38 | 43
Deferred Income Tax Expense (Benefit) | 2,073 | 1,087 | 692
Effective Income Tax Rate Reconciliation [Abstract] |  |  |
Federal income tax | $ 756 | $ 573 | $ 271
Federal income tax, percent | 35.00% | 35.00% | 35.00%
State deferred tax rate change | $ 10 | $ 11 | $ (24)
State deferred tax rate change, percent | 0.50% | 0.70% | (3.10%)
Taxes on foreign earnings, net of federal benefit | $ 42 | $ 28 | $ 26
Taxes on foreign earnings, net of federal benefit, percent | 1.90% | 1.70% | 3.50%
Net effects of noncontrolling interests | $ (14) | $ (4) | $ 15
Net effects of noncontrolling interests, percent | (0.70%) | (0.30%) | 2.00%
State income tax, net of federal benefit | $ 38 | $ 26 | $ 12
State income tax, net of federal benefit, percent | 1.80% | 1.60% | 1.50%
Dividend received deduction | $ (56) | $ (48) | $ (51)
Dividend received deduction, percent | (2.60%) | (2.90%) | (6.60%)
Adjustment to uncertain tax positions | $ (12) | $ (23) | $ (14)
Adjustment to uncertain tax positions, percent | (0.60%) | (1.40%) | (1.90%)
Valuation allowance on investment and tax credits | $ 13 | $ 34 | $ 0
Valuation allowance on investment and tax credits, percent | 0.60% | 2.10% | 0.00%
Impact of the 2017 Tax Reform | $ 1,240 | $ 0 | $ 0
Impact of the 2017 Tax Reform, percent | 57.40% | 0.00% | 0.00%
Nondeductible goodwill | $ 0 | $ 301 | $ 323
Nondeductible goodwill, percent | 0.00% | 18.50% | 41.70%
General business credit | $ (95) | $ 0 | $ 0
General business credit, percent | (4.40%) | (0.00%) | (0.00%)
Other | $ 16 | $ 19 | $ 6
Other, percent | 0.80% | 1.10% | 0.80%
Total Income Before Income Taxes | $ 1,938 | $ 917 | $ 564
Total, percent | 89.70% | 56.10% | 72.90%
Deferred Tax Assets [Abstract] |  |  |
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 adjustments | 37 | 74 |
Investments | 968 | 2,804 |
Other | 6 | 14 |
Valuation allowance | (171) | (184) |
Total deferred tax assets | 2,289 | 4,556 |
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Property, plant and equipment | 225 | 177 |
Other | 20 | 27 |
Total deferred tax liabilities | 245 | 204 |
Net deferred tax assets | 2,044 | 4,352 |
Canada |  |  |
Income Tax Disclosures [Line Items] |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations | 58 | 38 | $ 46
Mexico |  |  |
Income Tax Disclosures [Line Items] |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations | $ 7 | $ 6 | $ 1

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