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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