Annual report pursuant to Section 13 and 15(d)

SHAREOWNERS' EQUITY - Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail)

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SHAREOWNERS' EQUITY - Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common stock purchases, Shares                 (2.1) (9.1) (8.9)
Balance at beginning of year       $ 3,267         $ 3,267    
Net Income $ (3,347) $ 1,957 $ 1,768 965 $ (106) $ 1,750 $ 1,685 $ 1,111 1,343 $ 4,440 $ 4,791
Stock Repurchased During Period, Value                 (217) (1,000) (1,000)
Balance at end of year 657       3,267       657 3,267  
Balance at beginning of year       16         16    
Balance at end of year 12       16       12 16  
Dividends, Common Stock, Stock                 178 147 178
Payments for Repurchase of Common Stock                 224 1,004 1,011
Stockholders' Equity, Other                 0 0 (42)
Additional Paid-in Capital [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Option Premiums Received (Paid)                 0 21 34
Balance at beginning of year       150       0 150 0 0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition                 498 778 419
Stock Repurchased During Period, Value                 (217) (1,005) (859)
Stock Issued During Period, Value, New Issues                 434 356 406
Balance at end of year 865       150       865 150 0
Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year       9,105       8,006 9,105 8,006 5,852
Net Income                 1,343 4,440 4,791
Dividends, Common Stock                 (3,552) (3,341) (3,189)
Stock Repurchased During Period, Value                 0 0 (141)
Balance at end of year 6,896       9,105       $ 6,896 $ 9,105 $ 8,006
Dividends, per share                 $ 4.04 $ 3.84 $ 3.64
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect                 $ 0 $ 0 $ 735
Noncontrolling Interest [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year       $ 16       $ 16 16 16 30
Change in non-controlling interests                 (4) 0 (14)
Balance at end of year $ 12       $ 16       $ 12 $ 16 $ 16
Common Stock | Common Class A [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       156.0       163.0 156.0 163.0 173.0
Common stock purchases, Shares                 0.0 (3.0) (3.0)
Stock award plans, Shares                 6.0 5.0 3.0
Common stock issuances, Shares                 4.0 3.0 4.0
Conversions of class A to class B common stock, Shares                 (19.0) (12.0) (14.0)
Balance at end of year, Shares 147.0       156.0       147.0 156.0 163.0
Balance at beginning of year       $ 2       $ 2 $ 2 $ 2 $ 2
APIC, Share-based Payment Arrangement, Increase for Cost Recognition                 0 0 0
Stock Repurchased During Period, Value                 0 0 0
Stock Issued During Period, Value, New Issues                 0 0 0
Stock Issued During Period, Value, Conversion of Convertible Securities                 0 0 0
Balance at end of year $ 2       $ 2       $ 2 $ 2 $ 2
Common Stock | Common Class B [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       701.0       696.0 701.0 696.0 687.0
Common stock purchases, Shares                 (2.0) (7.0) (5.0)
Conversions of class A to class B common stock, Shares                 19.0 12.0 14.0
Balance at end of year, Shares 718.0       701.0       718.0 701.0 696.0
Balance at beginning of year       $ 7       $ 7 $ 7 $ 7 $ 7
Stock Repurchased During Period, Value                 0 0 0
Stock Issued During Period, Value, Conversion of Convertible Securities                 0 0 0
Balance at end of year $ 7       $ 7       $ 7 $ 7 $ 7