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Employee Benefit Plans Level 4 Net Periodic Benefits Cost and Other Recognized in the OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax $ 56 $ 60  
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Defined Benefit Plan, Service Cost 2 2 $ 2
Defined Benefit Plan, Interest Cost 237 235 258
Defined Benefit Plan, Expected Return on Plan Assets (311) (311) (325)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0 0
Defined Benefit Plan, Amortization of Gains (Losses) 56 60 45
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements   0 128
Defined Benefit Plan, Net Periodic Benefit Cost (16) (14) 108
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 0 0  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax (66) (185)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax (10) (125)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax 2,563 2,553  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 0 0  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax (2,563) (2,553)  
Defined Benefit Plan, Future Amortization of Gain (Loss) 60    
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 5 5  
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Interest Cost 11 12 14
Defined Benefit Plan, Expected Return on Plan Assets (10) (12) (14)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (6) (7) (7)
Defined Benefit Plan, Amortization of Gains (Losses) 5 5 5
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost 0 (2) $ (2)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax (6) (7)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax (4) (3)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax (5) (5)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax 122 123  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 85 91  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax (37) $ (32)  
Defined Benefit Plan, Future Amortization of Gain (Loss) $ 5