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Employee Benefit Plans - Change Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions $ 101    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 3,345 $ 3,563  
Defined Benefit Plan, Fair Value of Plan Assets, Excluded Interest Receivables   30  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets — beginning of year 3,592 4,678  
Actual return on plan assets (172) 549  
Employer contributions 103 280  
Benefits paid (161) (248)  
Expenses paid (17) (21)  
Settlements 0 (1,647)  
Foreign exchange adjustment (1) 1  
Fair value of plan assets — end of year 3,344 3,592  
Funded status — end of year (656) (784)  
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 85 113  
Defined Benefit Plan, Fair Value of Plan Assets, Excluded Interest Receivables   1  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets — beginning of year 114 138  
Actual return on plan assets (2) 11  
Employer contributions 0 0  
Benefits paid (27) (35)  
Expenses paid 0 0  
Settlements 0 0  
Foreign exchange adjustment 0 0  
Fair value of plan assets — end of year 85 114  
Funded status — end of year (135) (142)  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlements 0 6  
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 151 161 $ 167
Purchases 6 36  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sales 14 35  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Assets Transferred out of Level 3   11  
Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables   1  
Defined Benefit Plan, Equity Securities, Common Stock [Member] | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 1 1  
Defined Benefit Plan, Equity Securities, Common Stock [Member] | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 0 0  
Other Fixed Income [Member] | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 2 5  
Other Fixed Income [Member] | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 0 1  
Purchases   1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sales (1)    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Assets Transferred out of Level 3   (1)  
Corporate | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 19 25  
Corporate | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlements 0 0  
Corporate | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 14 14 13
Purchases 5 11  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sales 4 12  
Corporate | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables   0 1
Purchases   1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sales   (2)  
Residential mortgage-backed securities (RMBS) | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 15 17  
Residential mortgage-backed securities (RMBS) | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlements 0 5  
Residential mortgage-backed securities (RMBS) | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables 1 2 10
Purchases 0 1  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sales 1 4  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Assets Transferred out of Level 3 $ 0    
Residential mortgage-backed securities (RMBS) | Significant Unobservable Inputs (Level 3) | Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets Excluding Trade Receivables and Payables   0 $ 1
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlements   $ (1)