Share-Based Compensation Plans Share Options Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing share price (in dollars per share)	$ 83.89
Aggregate intrinsic value of options outstanding	$ 179
Aggregate intrinsic value of exercisable options outstanding	170
Unamortized deferred compensation expense	$ 336
Remaining weighted-average amortization period	2 years 1 month 6 days
Share options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Continuous years of service before options begin to vest	2 years
Vesting period	4 years
Continuous years of service before all options would vest for those options that do not vest incrementally	5 years
Maximum contractual term	10 years
Granted (in shares)	0	0	80,000
Granted (in dollars per share)	$ 0	$ 0	$ 53
Leadership Performance Plan Cycle [Member] | Share options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum contractual term	6 years
Incentive Compensation Plans [Member] | Share options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	80,000
Granted (in dollars per share)			$ 53