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Income Taxes Income Tax Disclosures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Results of Operations, Income before Income Taxes [Abstract]      
U.S. $ 1,739 $ 1,976 $ 1,466
Foreign 767 185 172
Income Before Income Taxes 2,506 2,161 1,638
Current tax expense (benefit) [Abstract]      
Federal (22) (137) (148)
State (45) (16) (28)
Foreign 249 18 6
Total 182 (135) (170)
Deferred tax expense (benefit) [Abstract]      
Federal 425 2,022 998
State 55 4 51
Foreign (75) 47 38
Total 405 2,073 1,087
Effective Income Tax Rate Reconciliation [Abstract]      
Federal income tax $ 526 $ 756 $ 573
Federal income tax, percent 21.00% 35.00% 35.00%
State deferred tax rate change $ (7) $ 10 $ 11
State deferred tax rate change, percent (0.30%) 0.50% 0.70%
Taxes on foreign earnings, net of federal benefit $ 131 $ 42 $ 28
Taxes on foreign earnings, net of federal benefit, percent 5.20% 1.90% 1.70%
Net effects of noncontrolling interests $ (65) $ (14) $ (4)
Net effects of noncontrolling interests, percent (2.60%) (0.70%) (0.30%)
State income tax, net of federal benefit $ 46 $ 38 $ 26
State income tax, net of federal benefit, percent 1.80% 1.80% 1.60%
Dividend received deduction $ (31) $ (56) $ (48)
Dividend received deduction, percent (1.20%) (2.60%) (2.90%)
Adjustments to uncertain tax positions $ (47) $ (12) $ (23)
Adjustments to uncertain tax positions, percent (1.90%) (0.60%) (1.40%)
Valuation allowance on investment and tax credits $ 14 $ 13 $ 34
Valuation allowance on investment and tax credits, percent 0.50% 0.60% 2.10%
Impact of the 2017 Tax Reform $ 0 $ 1,240 $ 0
Impact of the 2017 Tax Reform, percent 0.00% 57.40% 0.00%
Nondeductible goodwill $ 58 $ 0 $ 301
Nondeductible goodwill, percent 2.30% 0.00% 18.50%
General business credit $ (64) $ (95) $ 0
General business credit, percent (2.60%) (4.40%) (0.00%)
Other $ 26 $ 16 $ 19
Other, percent 1.20% 0.80% 1.10%
Total $ 587 $ 1,938 $ 917
Total, percent 23.40% 89.70% 56.10%
Deferred Tax Assets [Abstract]      
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 adjustments 33 37  
Investments 177 968  
Other 0 6  
Valuation allowance (178) (171)  
Total deferred tax assets 1,881 2,289  
Deferred Tax Liabilities, Gross [Abstract]      
Property, plant and equipment 270 225  
Other 45 20  
Total deferred tax liabilities 315 245  
Net deferred tax assets 1,566 2,044  
Canada      
Income Tax Disclosures [Line Items]      
Income Tax Expense 168 58 $ 38
Mexico      
Income Tax Disclosures [Line Items]      
Income Tax Expense $ 6 $ 7 $ 6