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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for accounts and notes receivable, current $ 303 $ 284
Allowance for long-term receivables, noncurrent $ 442 $ 387
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, par value (usd per share) $ 1.00 $ 1.00
Preferred stock, shares issued (in shares) 0 0
Common stock, shares authorized (in shares) 6,000,000,000 6,000,000,000
Common stock, par value (usd per share) $ 0.75 $ 0.75
Common stock, shares issued (in shares) 2,442,676,580 2,442,676,580
Treasury stock, shares (in shares) 512,870,523 517,490,263
Redeemable mezzanine equity $ 135 $ 120
Finance lease liabilities $ 449 $ 447