Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Dividends Declared Per Share	$ 1.71	$ 1.50
Paid-In-Surplus [Member]
Tax benefit, Stock-Based Employee Compensation	$ 4	$ 16
Retained Earnings [Member]
Dividends Declared Per Share	$ 1.71	$ 1.50