Shareholders' Equity (Stock Options Activity Roll Forward) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Options, outstanding, weighted average remaining contractual term	3 years 8 months
Options, exercisable, weighted average remaining contractual term	2 years 10 months
Options, vested and expected to vest, outstanding, weighted average remaining contractual term	3 years 8 months
Stock Options [Member]
Options, Outstanding at beginning of period	45,391
Options, Granted	404
Options, Exercised	(3,507)
Options, Forfeited or expired	(4,292)
Options, Outstanding at end of period	37,996
Options, Exercisable at end of period	31,354
Options, Exercisable and expected to vest at period end	37,513
Wtd. Avg. Exercise Price [Member]
Wtd. Avg. Exercise Price, Outstanding at beginning of period	$ 34.15
Wtd. Avg. Exercise Price, Granted	$ 30.08
Wtd. Avg. Exercise Price, Exercised	$ 27.14
Wtd. Avg. Exercise Price, Forfeited or expired	$ 32.86
Wtd. Avg. Exercise Price, Outstanding at end of period	$ 34.90
Wtd. Avg. Exercise Price, Exercisable at end of period	$ 36.32
Wtd. Avg. Exercise Price, Exercisable and expected to vest at end of period	$ 34.99
Aggregate Intrinsic Value [Member]
Options, outstanding, intrinsic value	$ 140
Options, exercisable, intrinsic value	80
Options, vested and expected to vest, outstanding, aggregate intrinsic value	$ 136