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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt Obligations) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Nov. 20, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount $ 48,711 $ 44,335                  
Long-term debt, Fair value 58,500 50,700                  
Repayments of Notes Payable 2,800 1,300                  
Interest payments 1,600 414 $ 218                
Securities Borrowed, Fair Value of Collateral 1,200                    
Short-term Bank Loans and Notes Payable 176 351                  
Current portion of long-term debt 2,000 2,763                  
Other short-term debt 164 232                  
Short term debt 2,340 3,346                  
Adjustments to Principal Value, Unamortized basis adjustment from swap terminations 149 175                  
Adjustments to Principal Value, Unamortized bond discounts and issuance costs (303) (280)                  
Debt Instrument, Unamortized Premium 1,755 1,914                  
Long-term Debt 50,336 46,150     $ 44,614 $ 46,106 $ 46,105   $ 24,390 $ 24,433 $ 5,635
Long-term debt $ 48,336 43,387                  
Line of Credit Facility [Line Items]                      
Number of Revolving Credit Facilities 4                    
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000                    
Interest Rate Swap [Member]                      
Debt Instrument [Line Items]                      
Derivative Liability 24 6                  
$2 Billion Maximum Borrowing Capacity [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity 2,000                    
$2 Billion Maximum Borrowing Capacity [Member] | Subsequent Event [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity       $ 2,000              
$1 Billion Maximum Borrowing Capacity [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity 1,000                    
$1.5 Billion Maximum Borrowing Capacity [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity 1,500                    
Term Loan Credit Agreement [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity   8,000                  
364-Day Tranche [Member] | Term Loan Credit Agreement [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity   1,000                  
Three-Year Tranche [Member] | Term Loan Credit Agreement [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity   4,000                  
Five-Year Tranche [Member] | Term Loan Credit Agreement [Member]                      
Line of Credit Facility [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity   3,000                  
$7.0 Billion Fixed Rate Unsecured Senior Notes [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 7,000                    
Proceeds from Debt, Net of Issuance Costs 6,900                    
Floating Rate Notes due 2020 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 0 750                  
2.875% Senior Notes due 2020 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 0 1,500                  
3.950% Senior Notes due 2020 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 0 500                  
2.250% Senior Notes due 2021 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
2.550% Notes due 2021 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
2.875% Senior Notes due 2021 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
Floating Rate Notes due 2022 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
2.000% Notes due 2022                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 750 750                  
2.600% Notes due 2022 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,500 1,500                  
3.250% Senior Notes due 2022 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
3.550% Senior Notes due 2022 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
0.537% Notes due 2023                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,500 0                  
2.750% Notes due 2023                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 750 750                  
3.250% Notes due 2023                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
3.250% Senior Notes due 2023 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
4.000% Senior Notes due 2023 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 700 700                  
7.150% Notes due 2023                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 302 302                  
2.900% Notes due 2024 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 3,250 3,250                  
3.625% Senior Notes due 2024 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
0.750% Notes due 2025                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 0                  
Euro notes due 2025 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 701 638                  
3.875% Senior Notes due 2025 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 2,500 2,500                  
3.200% Notes due 2026 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 2,250 2,250                  
6.800% Notes due 2026                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 256 256                  
1.125% Notes due 2027                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 0                  
3.250% Notes Due 2027 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 750 750                  
3.450% Senior Notes due 2027 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
3.900% Senior Notes due 2028 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,500 1,500                  
3.400% Notes due 2029 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 4,000 4,000                  
1.450% Notes due 2030                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,250 0                  
Euro Notes due 2035 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 701 638                  
5.875% Notes due 2036                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 287 287                  
6.125% Notes due 2038                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 226 226                  
4.125% Notes due 2039 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 2,000 2,000                  
2.350% Notes due 2040                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 750 0                  
5.700% Senior Notes due 2040 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 250 250                  
3.250% Notes due 2042                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
5.250% Senior Notes due 2043 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 400 400                  
4.500% Notes due 2044                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 500 500                  
4.625% Senior Notes due 2044 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,000 1,000                  
5.000% Senior Notes due 2045 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 2,000 2,000                  
4.350% Senior Notes due 2047 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,250 1,250                  
4.550% Senior Notes due 2048 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,500 1,500                  
4.250% Notes due 2049 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 3,750 3,750                  
2.550% Notes due 2050                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 1,500 0                  
6.875% Notes due 2097                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 87 87                  
0.13% - 5.75% Other - Maturing through 2024                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 51 51                  
$19 Billion Senior Unsecured Notes [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount   19,000                  
Proceeds from Debt, Net of Issuance Costs   $ 18,800                  
Senior Notes Debt Exchange [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount 18,500             $ 19,900      
Senior Notes Debt Exchange Remaining Principal Amount [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount $ 1,300