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Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Loss) Changes in Equity (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive Income (Loss) Changes in Equity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Ìý Ìý Ìý
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period $ (319) $ (284) $ (39)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 160 (59) (41)
Net loss (gain) reclassified from accumulated other comprehensive loss 26 24 (204)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period (133) (319) (284)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest Ìý Ìý Ìý
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Ìý Ìý Ìý
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period (316) (281) 264
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 163 (57) (43)
Net loss (gain) reclassified from accumulated other comprehensive loss 18 22 26
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period (135) (316) (281)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest Ìý Ìý Ìý
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Ìý Ìý Ìý
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period 0 0 225
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 3 0 3
Net loss (gain) reclassified from accumulated other comprehensive loss 0 0 (228)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period 3 0 0
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest Ìý Ìý Ìý
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Ìý Ìý Ìý
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period (3) (3) 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6) (2) (1)
Net loss (gain) reclassified from accumulated other comprehensive loss 8 2 (2)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period $ (1) $ (3) $ (3)