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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period $ 17,790,000,000  
Balance at end of period 18,252,000,000 $ 17,865,000,000
Foreign Exchange Translation Adjustment [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period (2,780,000,000) (2,566,000,000)
Other comprehensive income (loss) before reclassifications 216,000,000 (273,000,000)
Amounts reclassified from accumulated other comprehensive income (3,000,000) (3,000,000)
Net current period other comprehensive income (loss) 213,000,000 (276,000,000)
Balance at end of period (2,567,000,000) (2,842,000,000)
Pension and Other Postretirement Benefits Adjustments [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period (601,000,000) (675,000,000)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (22,000,000) (20,000,000)
Net current period other comprehensive income (loss) (22,000,000) (20,000,000)
Balance at end of period (623,000,000) (695,000,000)
Changes in Fair Value of Available for Sale Investments [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 4,000,000 0
Other comprehensive income (loss) before reclassifications (3,000,000) 0
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income (loss) (3,000,000) 0
Balance at end of period 1,000,000 0
Changes in Fair Value of Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 0 44,000,000
Other comprehensive income (loss) before reclassifications 8,000,000 195,000,000
Amounts reclassified from accumulated other comprehensive income (3,000,000) (55,000,000)
Net current period other comprehensive income (loss) 5,000,000 140,000,000
Balance at end of period 5,000,000 184,000,000
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period (3,377,000,000) (3,197,000,000)
Other comprehensive income (loss) before reclassifications 221,000,000 (78,000,000)
Amounts reclassified from accumulated other comprehensive income (28,000,000) (78,000,000)
Net current period other comprehensive income (loss) 193,000,000 (156,000,000)
Balance at end of period $ (3,184,000,000) $ (3,353,000,000)