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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for Accounts receivable $ 5,416 $ 4,988
Debt issuance cost $ 171 $ 170
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,800,000,000 1,800,000,000
Common stock, shares outstanding 356,979,800 370,535,900