Equity (Common Stock - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2019	Nov. 01, 2018	May 22, 2018	Nov. 01, 2017
Business Acquisition [Line Items]
Common Stock, Shares, Issued	1,177,680,299	1,171,824,242
Cost of shares issued	$ 206	$ 89	$ 167
Stock Repurchase Program, Authorized Amount				$ 2,000	$ 2,000	$ 1,500	$ 2,000
Class of Stock Disclosures [Abstract]
Repurchase amount outstanding	$ 985
Repurchase Shares	49,131,501	88,029,138	56,599,540
Treasury Stock, Value, Acquired, Cost Method	$ 2,285	$ 3,992	$ 2,927
Common Shares Issued For Stock Options [Member]
Business Acquisition [Line Items]
Common stock, shares issued	5,856,057	3,114,141	4,680,116
Cost of shares issued	$ 199	$ 108	$ 158
Treasury Shares Issued For Stock Options [Member]
Business Acquisition [Line Items]
Issued Treasury Stock	0	0	0