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Fair Value Measurements And Disclosure (Long-Term Debt And Other Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Carrying Amount [Member]    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Notes and debentures [1] $ 177,718 $ 162,526
Commercial paper 3,787 0
Bank borrowings 3 2
Investment securities [2] 3,646 2,447
Fair Value [Member]    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Commercial paper 3,787 0
Bank borrowings 3 2
Investment securities [2] 3,646 2,447
Fair Value [Member] | Level 2 [Member]    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Notes and debentures [1] $ 180,887 $ 171,938
[1]
Includes credit agreement borrowings.
[2]
Excludes investments accounted for under the equity method.