Stock-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 02, 2013 Abbott item	Jan. 02, 2013 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2013 RSAs & RSUs	Sep. 30, 2013 RSAs & RSUs
Stock-Based Compensation
Stock compensation expense recognized	$ 41	$ 30	$ 175	$ 156
Number of awards received in connection with the separation					1
Assumptions on which the expense related to stock options granted is based
Risk-free interest rate (as a percent)							1.10%
Average life of options							6 years
Volatility (as a percent)							32.63%
Dividend yield (as a percent)							4.30%
Fair value per stock option (in dollars per share)							$ 6.87
Options
Options converted (in shares)						47,718
Granted (in shares)							3,128
Exercised (in shares)							(11,041)
Lapsed (in shares)							(221)
Outstanding at the end of the period (in shares)							39,584
Exercisable at the end of the period (in shares)							36,007
Weighted average exercise price
Options converted (in dollars per share)						$ 27.00
Granted (in dollars per share)							$ 37.91
Exercised (in dollars per share)							$ 27.47
Lapsed (in dollars per share)							$ 27.71
Outstanding at the end of the period (in dollars per share)							$ 27.73
Exercisable at the end of the period (in dollars per share)							$ 27.28
Weighted average remaining life (in years)
Outstanding at the end of the period							3 years 8 months 12 days
Exercisable at end of the period							3 years 3 months 18 days
Aggregate intrinsic value
Outstanding at the end of the period							677
Exercisable at the end of the period							632
Additional information
Unrecognized compensation cost							3
Period for recognition of unrecognized compensation cost							2 years		2 years
Aggregate intrinsic value of options exercised	41		157
Share units
Awards converted (in shares)									15,394
Granted (in shares)									7,387
Vested (in shares)									(7,483)
Lapsed (in shares)									(423)
Outstanding at the end of the period (in shares)								14,875	14,875
Unvested shares at the end of the period (in shares)								14,719	14,719
Weighted average grant date fair value
Awards converted (in dollars per share)									$ 27.55
Granted (in dollars per share)									$ 36.18
Vested (in dollars per share)									$ 27.30
Lapsed (in dollars per share)									$ 30.39
Outstanding at the end of the period (in dollars per share)									$ 31.89
Unvested shares at the end of the period (in dollars per share)								$ 31.90	$ 31.90
Additional information
Fair market value of awards vested								5	282
Unrecognized compensation cost								$ 198	$ 198