Equity (Common Stock) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common stock, shares issued	489,883,553	485,708,000	482,791,000	492,797,409	489,883,553	485,708,000
New issuances, common stock, employee benefits and compensation plans	2,914,000	4,176,000	2,917,000
Common stock, shares issued	492,797,409	489,883,553	485,708,000
Treasury stock, shares	(52,829,617)	(18,707,000)	(811,000)
Repurchase of common stock	(35,068,000)	(34,122,000)	(17,897,000)
Treasury stock, shares	(87,897,810)	(52,829,617)	(18,707,000)
Common stock, shares issued	489,883,553	485,708,000	482,791,000
Common stock, shares outstanding				404,899,599	437,053,936	467,000,000