Share-Based Incentive Compensation (details) - Restricted Stock - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 02, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted stock units, deferred stock units and performance share awards [Member]
Share-based compensation
Fair value of shares that vested during the year		$ 179	$ 147	$ 151
Restricted stock units, deferred stock units and performance share awards [Member] | Subsequent Event [Member]
Summary of other equity instruments [Roll Forward]
Other equity instruments, granted, number	1,094,685
Other equity instruments, granted, weighted average grant-date fair value	$ 106.03
Restricted and deferred stock units [Member]
Summary of other equity instruments [Roll Forward]
Other equity instruments, nonvested, number, beginning of year		1,760,971
Other equity instruments, granted, number		607,200
Other equity instruments, vested, number		(789,538)
Other equity instruments, forfeited, number		(142,675)
Other equity instruments, nonvested, number, end of year		1,435,958	1,760,971
Other equity instruments, nonvested, weighted average grant-date fair value, beginning of year		$ 72.40
Other equity instruments, granted, weighted average grant-date fair value		106.02
Other equity instruments, vested, weighted average grant-date fair value		69.03
Other equity instruments, forfeited, weighted average grant-date fair value		73.57
Other equity instruments, nonvested, weighted average grant-date fair value, end of year		$ 88.35	$ 72.40
Other equity instruments, nonvested dividend equivalents, number, beginning of year		387
Other equity instruments, nonvested dividend equivalents, number, end of year		396	387
Restricted and deferred stock units [Member] | Subsequent Event [Member]
Summary of other equity instruments [Roll Forward]
Other equity instruments, granted, number	618,274
Restricted stock units [Member]
Share-based compensation
Award vesting period		3 years
Performance shares [Member]
Share-based compensation
Award vesting period		3 years
Peformance period		3 years
Summary of other equity instruments [Roll Forward]
Other equity instruments, nonvested, number, beginning of year		1,290,069
Other equity instruments, granted, number		460,855
Other equity instruments, vested, number		(676,177)
Other equity instruments, forfeited, number		(31,352)
Other equity instruments, performance-based adjustment, number		58,594
Other equity instruments, nonvested, number, end of year		1,101,989	1,290,069
Other equity instruments, nonvested, weighted average grant-date fair value, beginning of year		$ 79.46
Other equity instruments, granted, weighted average grant-date fair value		106.04
Other equity instruments, vested, weighted average grant-date fair value		79.28
Other equity instruments, forfeited, weighted average grant-date fair value		86.41
Other equity instruments, performance-based adjustment, weighted average grant-date fair value		94.06
Other equity instruments, nonvested, weighted average grant-date fair value, end of year		$ 91.27	$ 79.46
Other equity instruments, nonvested dividend equivalents, number, beginning of year		38,738
Other equity instruments, nonvested dividend equivalents, number, end of year		40,663	38,738
Performance shares [Member] | Subsequent Event [Member]
Summary of other equity instruments [Roll Forward]
Other equity instruments, granted, number	476,411
Performance shares [Member] | Feburary 2014, 2015 and 2016 Awards [Member] | Minimum [Member]
Share-based compensation
Percentage of of performance shares to vest		50.00%
Performance shares [Member] | Feburary 2014, 2015 and 2016 Awards [Member] | Maxiumum [Member]
Share-based compensation
Percentage of of performance shares to vest		150.00%