CAPITAL STOCK - Common Stock Outstanding (Details) - shares	12 Months Ended			91 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Movement In Common Stock Outstanding [Roll Forward]
Balance, beginning of year (in shares)	376,062,670	374,696,222	380,954,864
Shares issued for stock-based compensation plans:
Treasury shares issued (in shares)	17,448	31,701	2,454
Common shares issued (in shares)	1,402,512	1,334,747	1,566,237
Treasury shares acquired (in shares)	0	0	(7,827,333)	(40,000,000)
Balance, end of year (in shares)	377,482,630	376,062,670	374,696,222	377,482,630