Shareholders' Equity (Stock Options Activity Roll Forward) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Options, outstanding, weighted average remaining contractual term	3 years 3 months
Options, exercisable, weighted average remaining contractual term	2 years 9 months
Options, exercisable and expected to vest, weighted average remaining contractual term	3 years 3 months
Stock Options [Member]
Options, Outstanding at beginning of period	37,996
Options, Granted	276
Options, Exercised	(8,838)
Options, Forfeited or expired	(1,060)
Options, Outstanding at end of period	28,374
Number of options exercisable	25,074
Options, Exercisable and expected to vest at period end	28,138
Wtd. Avg. Exercise Price [Member]
Wtd. Avg. Exercise Price, Outstanding at beginning of period	34.90
Wtd. Avg. Exercise Price, Granted	37.55
Wtd. Avg. Exercise Price, Exercised	34.17
Wtd. Avg. Exercise Price, Forfeited or expired	36.73
Wtd. Avg. Exercise Price, Outstanding at end of period	35.09
Wtd. Avg. Exercise Price, Exercisable at end of period	35.74
Wtd. Avg. Exercise Price, Exercisable and expected to vest at end of period	35.13
Aggregate Intrinsic Value [Member]
Options, outstanding, intrinsic value	134
Options, exercisable, intrinsic value	105
Options, exercisable and expected to vest, aggregate intrinsic value	132