Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

v3.6.0.2
Employee Benefit Plans - Narrative (Details) - USD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Increase (decrease) from change in weighted average discount rates $ 1,300,000,000 $ (930,000,000)  
Percentage of prior years market gains (losses) recognized at next measurement date 60.00%    
Percentage of prior years market gains (losses) recognized equally over four year period 40.00%    
Defined Contribution Plan:      
Cost recognized $ 1,000,000,000 $ 1,000,000,000 $ 1,000,000,000
Number of common stock shares held in plan (in shares) 224 236  
Dividend payments to the plan $ 60,000,000 $ 48,000,000 $ 29,000,000
Qualified Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 0 0  
Effect of 25 basis point decline in discount rate on net periodic benefit cost 9,000,000    
Effect of 25 basis point decline in expected return on plan assets on net periodic benefit cost 43,000,000    
Plan assets recognized in the next fiscal year with respect to decline in discount rate 6,000,000    
Plan assets recognized in the next fiscal year with respect to decline in expected return 45,000,000    
Qualified Pension Plan | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Amount of employer and related party securities included in plan assets $ 203,000,000 $ 189,000,000  
Actual plan asset allocations 1.11% 1.05%  
Other Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions $ 0 $ 0  
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 48,000,000 58,000,000  
Estimated future employer contributions in next fiscal year 20,000,000    
Nonqualified and Other Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 104,000,000 97,000,000  
Estimated future employer contributions in next fiscal year 96,000,000    
Postretirement Health and Life Plans      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 104,000,000 $ 79,000,000  
Estimated future employer contributions in next fiscal year $ 99,000,000    
Percentage of unrecognized gain (loss) recognized during the period 50.00%    
Health care cost trend rate assumed for next fiscal year 7.00%    
Ultimate health care cost trend rate 5.00%    
Effect of 1% increase on service and interest cost components $ 1,000,000    
Effect of 1% increase on accumulated postretirement benefit obligation 29,000,000    
Effect of 1% decrease on service and interest cost components 1,000,000    
Effect of 1% decrease on accumulated postretirement benefit obligation 25,000,000    
Postretirement Health and Life Plans      
Defined Benefit Plan Disclosure [Line Items]      
Effect of 25 basis point decline in expected return on plan assets on net periodic benefit cost 8,000,000    
Plan assets recognized in the next fiscal year with respect to decline in expected return $ 7,000,000