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Employee Benefit Plans Level 4 Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer $ 300  
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 301 $ 101
Other Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 0 0
UNITED STATES | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer 301 101
UNITED STATES | Other Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Contributions by Employer $ 0 $ 0