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Loans Payable, Long-Term Debt and Other Commitments - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term debt, current maturities   $ 3,000,000,000 $ 300,000,000  
Loans payable and current portion of long-term debt   3,057,000,000 568,000,000  
Long-term debt   21,353,000,000 24,274,000,000  
Payment for Debt Extinguishment or Debt Prepayment Cost $ 810,000,000      
Repurchased face amount $ 585,000,000      
Loss on extinguishment of debt   $ (191,000,000)    
Maximum total debt to capitalization ratio allowable by financial covenants under certain borrowings (not to exceed) (as percent)   60.00%    
Long-term debt, maturities, repayments of principal in 2018   $ 3,000,000,000    
Long-term debt, maturities, repayments of principal in 2019   1,300,000,000    
Long-term debt, maturities, repayments of principal in 2020   1,900,000,000    
Long-term debt, maturities, repayments of principal in 2021   2,300,000,000    
Long-term debt, maturities, repayments of principal in 2022   2,200,000,000    
Available borrowing capacity under credit facility   $ 6,000,000,000.0    
Term of debt   5 years    
Rental expense under operating leases net of sublease income   $ 327,000,000 292,000,000 $ 303,000,000
Minimum aggregate rental commitments under noncancellable leases in 2018   255,000,000    
Minimum aggregate rental commitments under noncancellable leases in 2019   175,000,000    
Minimum aggregate rental commitments under noncancellable leases in 2020   126,000,000    
Minimum aggregate rental commitments under noncancellable leases in 2021   90,000,000    
Minimum aggregate rental commitments under noncancellable leases in 2022   68,000,000    
Minimum aggregate rental commitments under noncancellable leases thereafter   138,000,000    
Other Variable Rate Debt        
Debt Instrument [Line Items]        
Long-term debt   $ 300,000,000 $ 147,000,000  
Effective interest rate (as percent)   1.42% 0.89%  
6.30% debentures due 2026        
Debt Instrument [Line Items]        
Long-term debt   $ 135,000,000 $ 152,000,000  
Stated interest rate (as percent)   6.30%    
Notes Subject To Repayment At Option Of Holder        
Debt Instrument [Line Items]        
Loans payable and current portion of long-term debt   $ 73,000,000 $ 267,000,000  
Commercial paper        
Debt Instrument [Line Items]        
Weighted-average interest rate of commercial paper (as percent)   0.85% 0.40%