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Employee Benefit Plans Level 4 (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Settlements, Benefit Obligation $ 1,600,000,000      
Defined Benefit Plan, Contributions by Employer 280      
Component of periodic benefit cost        
Interest cost $ (9,000,000)   $ (28,000,000)  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.58%      
Weighted Average Discount Rate, Percent 4.22%      
Component of periodic benefit cost        
Service cost $ 1,000,000 $ 1,000,000 3,000,000 $ 2,000,000
Interest cost (36,000,000) (60,000,000) (134,000,000) (178,000,000)
Expected return on plan assets (55,000,000) (78,000,000) (214,000,000) (231,000,000)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 11,000,000 15,000,000 41,000,000 42,000,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0 750,000,000 0
Net periodic cost (benefit) $ (7,000,000) (2,000,000) 714,000,000 (9,000,000)
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.55%      
Weighted Average Discount Rate, Percent 4.19%      
Other Postretirement Benefit Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.13%      
Weighted Average Discount Rate, Percent 3.97%      
Component of periodic benefit cost        
Service cost $ 0 0 6,000,000 0
Interest cost (2,000,000) (2,000,000) (6,000,000) (8,000,000)
Expected return on plan assets (2,000,000) (2,000,000) (5,000,000) (7,000,000)
Amortization of prior service credit (2,000,000) (2,000,000) 0 (5,000,000)
Amortization of actuarial loss 1,000,000 2,000,000 4,000,000 4,000,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0 0 0
Net periodic cost (benefit) (1,000,000) $ 0 $ (1,000,000) $ 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 144,000,000      
After Tax [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ 488,000,000