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Consolidated Statement of Stockholder's Equity - USD ($)
$ in Millions
Total
Common Stock
Capital in excess of par value
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of new accounting standards $ 0 $ 0 $ 0 $ 18 $ (18) $ 0
Balance at beginning of period at Dec. 31, 2017 9,641 808 1,451 13,832 12 (6,462)
Balance at beginning of period (ASU 2017-12) at Dec. 31, 2017 9,641 808 1,451 13,850 (6) (6,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (2,000) 0 0 0 0 (2,000)
Issuance of common and treasury stock pursuant to Employee stock plans 23 0 13 0 0 10
Share-based compensation 46 0 46 0 0 0
Cash dividends $ (348) 0 0 (348) 0 0
Cash dividends, per share (in dollars per share) $ 0.605          
Comprehensive income (loss) $ 2,491 0 0 2,465 26 0
Balance at end of period at Dec. 31, 2018 9,853 808 1,510 15,967 20 (8,452)
Balance at end of period (ASU 2016-02) at Dec. 31, 2018 9,908 808 1,510 16,022 20 (8,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of new accounting standards 55 0 0 55 0 0
Repurchase of common stock (2,000) 0 0 0 0 (2,000)
Issuance of common and treasury stock pursuant to Employee stock plans 27 0 16 0 0 11
Share-based compensation 55 0 55 0 0 0
Cash dividends $ (377) 0 0 (377) 0 0
Cash dividends, per share (in dollars per share) $ 0.700          
Comprehensive income (loss) $ 2,219 0 0 2,300 (81) 0
Balance at end of period at Dec. 31, 2019 9,832 808 1,581 17,945 (61) (10,441)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (451) 0 0 0 0 (451)
Issuance of common stock, net of issuance costs 2,224 80 2,144 0 0 0
Issuance of common and treasury stock pursuant to Employee stock plans 34 0 17 0 0 17
Share-based compensation 17 0 17 0 0 0
Cash dividends $ (94) 0 0 (94) 0 0
Cash dividends, per share (in dollars per share) $ 0.180          
Stock warrants $ 40 0 40 0 0 0
Equity feature of convertible notes, net of issuance costs 392 0 392 0 0 0
Comprehensive income (loss) (3,118) 0 0 (3,074) (44) 0
Balance at end of period at Dec. 31, 2020 $ 8,876 $ 888 $ 4,191 $ 14,777 $ (105) $ (10,875)