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Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jul. 21, 2015
Debt Instrument [Line Items]      
Long-term Debt and Capital Lease Obligations, Including Current Maturities $ 10,457,000,000 $ 10,942,000,000  
Short-term borrowings and current maturities of long-term debt 36,000,000 512,000,000  
Long-term debt 10,421,000,000 10,430,000,000  
Debt Instrument, Unamortized Discount $ (92,000,000) (98,000,000)  
Debt instrument call feature description We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.    
Line of credit facility, maximum borrowing capacity     $ 3,000,000,000.0
Line of Credit Facility, Remaining Borrowing Capacity $ 3,000,000,000 3,000,000,000  
Long-term Debt, Current Maturities 34,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two 27,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 696,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 12,000,000    
Long-term Debt, Maturities Repayments of Principal in Year Five 1,100,000,000    
Senior notes due November 2045 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 2,000,000,000 $ 2,000,000,000  
Interest rate (in hundredths) 5.00% 5.00%  
Maturity date November 2045 November 2045  
Senior Notes due November 2025 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 2,000,000,000 $ 2,000,000,000  
Interest rate (in hundredths) 3.80% 3.80%  
Maturity date November 2025 November 2025  
Senior notes due August 2023      
Debt Instrument [Line Items]      
Long-term debt $ 1,100,000,000 $ 1,100,000,000  
Interest rate (in hundredths) 3.50% 3.50%  
Maturity date August 2023 August 2023  
Senior Notes due November 2035 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Interest rate (in hundredths) 4.85% 4.85%  
Maturity date November 2035 November 2035  
Senior notes due September 2039      
Debt Instrument [Line Items]      
Long-term debt $ 1,000,000,000 $ 1,000,000,000  
Interest rate (in hundredths) 7.45% 7.45%  
Maturity date September 2039 September 2039  
Senior notes due August 2043      
Debt Instrument [Line Items]      
Long-term debt $ 900,000,000 $ 900,000,000  
Interest rate (in hundredths) 4.75% 4.75%  
Maturity date August 2043 August 2043  
Senior notes due September 2038      
Debt Instrument [Line Items]      
Long-term debt $ 800,000,000 $ 800,000,000  
Interest rate (in hundredths) 6.70% 6.70%  
Maturity date September 2038 September 2038  
Senior notes due November 2021      
Debt Instrument [Line Items]      
Long-term debt $ 500,000,000 $ 500,000,000  
Interest rate (in hundredths) 3.25% 3.25%  
Maturity date November 2021 November 2021  
Senior notes due November 2041      
Debt Instrument [Line Items]      
Long-term debt $ 500,000,000 $ 500,000,000  
Interest rate (in hundredths) 4.50% 4.50%  
Maturity date November 2041 November 2041  
Senior notes due August 2018      
Debt Instrument [Line Items]      
Long-term debt $ 0 $ 400,000,000  
Interest rate (in hundredths) 2.00% 2.00%  
Repayments of Senior Debt $ 400,000,000    
Maturity date August 2018 August 2018  
Senior debentures due August 2096      
Debt Instrument [Line Items]      
Long-term debt $ 300,000,000 $ 300,000,000  
Interest rate (in hundredths) 7.60% 7.60%  
Debt instruments non-call feature description may not be redeemed prior to maturity    
Maturity date August 2096 August 2096  
Senior debentures due February 2021      
Debt Instrument [Line Items]      
Long-term debt $ 185,000,000 $ 185,000,000  
Interest rate (in hundredths) 8.75% 8.75%  
Maturity date February 2021 February 2021  
Senior notes due February 2027 [Member] [Domain]      
Debt Instrument [Line Items]      
Long-term debt $ 104,000,000 $ 104,000,000  
Interest rate (in hundredths) 6.75% 6.75%  
Maturity date February 2027 February 2027  
Other Debt Obligations [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 160,000,000 $ 251,000,000