Equity Equity (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Equity [Abstract]
Common stock, shares outstanding	374,331,998	404,899,599	437,054,000	383,523,000	392,775,000	399,761,000	416,591,000	425,752,000	432,691,000
Change in Common Stock Outstanding
Total issued at January 1,	492,797,409	489,884,000	485,708,000
Employee benefits and compensation plans	4,160,000	2,914,000	4,176,000
Total issued at December 31,	496,957,805	492,797,409	489,884,000
Treasury balance at January 1,	87,897,810	52,830,000	18,707,000
Repurchase of common stock	34,728,000	35,068,000	34,122,000
Treasury balance at December 31,	122,625,807	87,897,810	52,830,000