Stock-Based Compensation Programs (Details)	1 Months Ended				12 Months Ended
	Jul. 31, 2016 $ / shares	Jan. 31, 2016 $ / shares shares	Feb. 28, 2015 $ / shares	Jan. 31, 2014 $ / shares	Dec. 31, 2016 USD ($) installment $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) shares
Restricted stock activity, Weighted average grant price
Unrecognized compensation cost related to nonvested share-based compensation arrangements | $					$ 57,000,000
Expected weighted-average period for recognition of unrecognized stock-based compensation costs					2 years 6 months
Selling, general and administrative
Restricted stock activity, Weighted average grant price
Share based compensation expense | $					$ 35,000,000	$ 25,000,000	$ 25,000,000
Expenses for share-based compensation arrangements, after tax | $					$ 22,000,000	$ 15,000,000	$ 16,000,000
Stock option and SSARs
Stock-Based Compensation Programs
Number of equal installments commencing one year from the date of grant | installment					4
Vesting period					1 year
Expiration period of options					10 years
Outstanding Options, Number of Shares
Beginning of year (in shares)						9,716,251
Granted (in shares)					1,287,432
Exercised (in shares)					(2,040,183)
Canceled/forfeited (in shares)					(290,309)
End of the period (in shares)					8,673,191		9,716,251
Vested and exercisable, end of period (in shares)					5,937,866
Reserved for future grants (in shares)					4,809,631
Outstanding Options, Weighted Average Exercise Price
Beginning of year (in dollars per share) | $ / shares		$ 37.50			$ 37.50
Granted (in dollars per share) | $ / shares					67.21
Exercised (in dollars per share) | $ / shares					31.81
Canceled/forfeited (in dollars per share) | $ / shares					57.72
End of period (in dollars per share) | $ / shares					42.57	$ 37.50
Vested and exercisable, end of period (in dollars per share) | $ / shares					$ 33.71
Additional disclosures
Weighted average remaining contractual term of options outstanding						5 years 2 months 12 days
Aggregate intrinsic value of options outstanding | $					$ 282,000,000
Weighted average remaining contractual term of options vested and exercisable						3 years 10 months 24 days
Aggregate intrinsic value of options vested and exercisable | $					246,000,000
Total fair value of options vested | $					$ 13,000,000	$ 12,000,000	$ 13,000,000
Weighted average fair value at grant date (in dollars per share) | $ / shares	$ 16.71	$ 18.58	$ 14.20	$ 9.81
Weighted average assumptions used in estimation of fair values of options
Expected dividend yield (as a percent)					0.73%	0.79%	1.06%
Expected stock price volatility (as a percent)					24.14%	22.11%	21.41%
Risk-free interest rate (as a percent)					1.22%	1.39%	1.65%
Expected life of options					6 years 1 month 6 days	5 years 10 months 6 days	5 years 6 months
Stock options
Additional disclosures
Cash received from options exercised | $					$ 36,000,000	$ 22,000,000	$ 23,000,000
Intrinsic value of options exercised | $					45,000,000	33,000,000	31,000,000
Tax benefit from exercise of options | $					$ 22,000,000
Restricted stock activity, Weighted average grant price
Maximum employer's contribution as a percentage of each participating employee's monthly payroll deduction					20.00%
Maximum employer's contribution to each participating employee | $					$ 500
Company contributions | $					$ 4,000,000	$ 4,000,000	$ 4,000,000
Restricted shares and restricted stock units
Stock-Based Compensation Programs
Vesting period					5 years
Restricted stock activity, Number of shares
Beginning of the period (in shares)		861,945			861,945
Granted (in shares)					382,903
Vested (in shares)					(201,662)
Canceled/forfeited (in shares)					(25,125)
End of the period (in shares)					1,018,061	861,945
Restricted stock activity, Weighted average grant price
Beginning of the period (in dollars per share) | $ / shares		$ 45.27			$ 45.27
Granted (in dollars per share) | $ / shares					74.13
Vested (in dollars per share) | $ / shares					46.90
Canceled/forfeited (in dollars per share) | $ / shares					52.79
End of the period (in dollars per share) | $ / shares					$ 55.62	$ 45.27
PCEQs
Stock-Based Compensation Programs
Vesting period					3 years
Restricted stock activity, Number of shares
Granted (in shares)					132,818	116,559	143,305
Restricted stock activity, Weighted average grant price
Share based compensation expense | $					$ 15,000,000	$ 2,016,000,000	$ 7,000,000
PCEQs | Minimum
Restricted stock activity, Weighted average grant price
Vest range of participant's assigned award opportunity (as a percent)					0.00%
PCEQs | Maximum
Restricted stock activity, Weighted average grant price
Vest range of participant's assigned award opportunity (as a percent)					200.00%