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Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt instruments $ 23,730 $ 30,234
Debt due within one year (5,000) (6,722)
Reclassified from short-term debt 9,900 10,000
Unamortized discounts and debt issuance costs (24) (35)
Capital lease obligations 127 94
Total long-term debt [1] 28,733 33,571
Long-term debt maturing 2019 5,000  
Long-term debt maturing 2020 5,054  
Long-term debt maturing 2021 2,272  
Long-term debt maturing 2022 4,050  
Long-term debt maturing 2023 3,003  
Long-term debt maturing after 2023 4,351  
Notes | 3.191% notes due 2023    
Debt Instrument [Line Items]    
Long-term debt instruments $ 2,250 2,250
Interest rate 3.191%  
Notes | 2.954% notes due 2026    
Debt Instrument [Line Items]    
Long-term debt instruments $ 2,250 2,250
Interest rate 2.954%  
Notes | 2.355% notes due 2022    
Debt Instrument [Line Items]    
Long-term debt instruments $ 2,000 2,000
Interest rate 2.355%  
Notes | 1.961% notes due 2020    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,750 1,750
Interest rate 1.961%  
Notes | 4.950% notes due 2019    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,500 1,500
Interest rate 4.95%  
Notes | 1.561% notes due 2019    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,350 1,350
Interest rate 1.561%  
Notes | 2.100% notes due 2021    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,350 1,350
Interest rate 2.10%  
Notes | 2.419% notes due 2020    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,250 1,250
Interest rate 2.419%  
Notes | 2.427% notes due 2020    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,000 1,000
Interest rate 2.427%  
Notes | 2.895% notes due 2024    
Debt Instrument [Line Items]    
Long-term debt instruments $ 1,000 1,000
Interest rate 2.895%  
Notes | 2.193% notes due 2019    
Debt Instrument [Line Items]    
Long-term debt instruments $ 750 750
Interest rate 2.193%  
Notes | 2.566% notes due 2023    
Debt Instrument [Line Items]    
Long-term debt instruments $ 750 750
Interest rate 2.566%  
Notes | 3.326% notes due 2025    
Debt Instrument [Line Items]    
Long-term debt instruments $ 750 750
Interest rate 3.326%  
Notes | 2.498% notes due 2022    
Debt Instrument [Line Items]    
Long-term debt instruments $ 700 700
Interest rate 2.498%  
Notes | 2.411% notes due 2022    
Debt Instrument [Line Items]    
Long-term debt instruments $ 700 700
Interest rate 2.411%  
Notes | 1.991% notes due 2020    
Debt Instrument [Line Items]    
Long-term debt instruments $ 600 600
Interest rate 1.991%  
Notes | 1.686% notes due 2019    
Debt Instrument [Line Items]    
Long-term debt instruments $ 550 550
Interest rate 1.686%  
Notes | 1.718% notes due 2018    
Debt Instrument [Line Items]    
Long-term debt instruments $ 0 2,000
Interest rate 1.718%  
Notes | 1.365% notes due 2018    
Debt Instrument [Line Items]    
Long-term debt instruments $ 0 1,750
Interest rate 1.365%  
Notes | 1.790% notes due 2018    
Debt Instrument [Line Items]    
Long-term debt instruments $ 0 1,250
Interest rate 1.79%  
Floating Rate Notes | Floating rate notes due 2019 (2.905%)    
Debt Instrument [Line Items]    
Long-term debt instruments $ 850 850
Interest rate 2.905%  
Floating Rate Notes | Floating rate notes due 2021 (3.313%)    
Debt Instrument [Line Items]    
Long-term debt instruments $ 650 650
Interest rate 3.313%  
Floating Rate Notes | Floating rate notes due 2022 (3.245%)    
Debt Instrument [Line Items]    
Long-term debt instruments $ 650 650
Interest rate 3.254%  
Floating Rate Notes | Floating rate notes due 2020 (2.948%)    
Debt Instrument [Line Items]    
Long-term debt instruments $ 400 400
Interest rate 2.948%  
Floating Rate Notes | Floating rate notes due 2018    
Debt Instrument [Line Items]    
Long-term debt instruments $ 0 1,650
Loans | 3.400% loan    
Debt Instrument [Line Items]    
Long-term debt instruments $ 218 0
Interest rate 3.40%  
Loans | Amortizing bank loan due 2018    
Debt Instrument [Line Items]    
Long-term debt instruments $ 0 72
Debentures | 8.625% debentures due 2032    
Debt Instrument [Line Items]    
Long-term debt instruments $ 147 147
Interest rate 8.625%  
Debentures | 8.625% debentures due 2031    
Debt Instrument [Line Items]    
Long-term debt instruments $ 108 108
Interest rate 8.625%  
Debentures | 8.000% debentures due 2032    
Debt Instrument [Line Items]    
Long-term debt instruments $ 75 75
Interest rate 8.00%  
Debentures | 9.750% debentures due 2020    
Debt Instrument [Line Items]    
Long-term debt instruments $ 54 54
Interest rate 9.75%  
Debentures | 8.875% debentures due 2021    
Debt Instrument [Line Items]    
Long-term debt instruments $ 40 40
Interest rate 8.875%  
Medium-term Notes | Medium-term notes, maturing from 2021 to 2038 (6.629%)    
Debt Instrument [Line Items]    
Long-term debt instruments $ 38 $ 38
Interest rate 6.629%  
[1] Includes capital lease obligations of $127 and $94 at December 31, 2018 and 2017, respectively.