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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 18 $ 20
Other Current Assets, Allowance 2 0
Other intangible assets, accumulated amortization 323 307
Loans and Leases Receivable, Allowance 31 0
Other Noncurrent Assets, Allowance $ 27 $ 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,200,000,000 1,200,000,000
Common stock, shares issued (in shares) 817,964,353 817,843,916
Common stock, shares outstanding (in shares) 664,935,827 663,952,656
Treasury stock, shares (in shares) 153,028,526 153,891,260
Variable Interest Entity [Line Items]    
Non Recourse Debt Non Current $ 15,639 $ 14,914
Non-recourse debt, including $340 and $337, respectively, related to variable interest entities 2,041 1,868
Consolidated Variable Interest Entities [Member]    
Variable Interest Entity [Line Items]    
Non Recourse Debt Non Current 4,375 3,872
Non-recourse debt, including $340 and $337, respectively, related to variable interest entities $ 340 $ 337