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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Compensation Expense For Equity Programs And Related Tax Benefits Text Block [Table Text Block]
(millions)
 
2016
 
2015
 
2014
Pre-tax compensation expense
 
$
68

 
$
55

 
$
41

Related income tax benefit
 
$
25

 
$
20

 
$
15
Schedule of Cash and Tax Benefits Received Upon Exercise of Stock Options and Similar Instruments [Table Text Block]
(millions)
 
2016
 
2015
 
2014
Total cash received from option exercises and similar instruments
 
$
368

 
$
261

 
$
217

Tax benefits realized upon exercise or vesting of stock-based awards:
 
 
 
 
 
 
Windfall benefits classified as cash flow from operating activities
 
$
36

 
NA

 
NA

Windfall benefits classified as cash flow from financing activities
 
NA

 
$
14

 
$
11
Schedule of Stock Option Valuation Model Assumptions for Grants [Table Text Block]
Stock option valuation model
assumptions for grants within the
year ended:
 
2016
 
2015
 
2014
Weighted-average expected volatility
 
17.00
%
 
16.00
%
 
15.00
%
Weighted-average expected term (years)
 
6.88

 
6.87

 
7.34

Weighted-average risk-free interest rate
 
1.60
%
 
1.98
%
 
2.35
%
Dividend yield
 
2.60
%
 
3.00
%
 
3.00
%
Weighted-average fair value of options granted
 
$
9.44

 
$
7.21

 
$
6.70
Schedule of Share-based Compensation, Activity [Table Text Block]
Employee and
director stock
options
 
Shares
(millions)
 
Weighted-
average
exercise
price
 
Weighted-
average
remaining
contractual
term (yrs.)
 
Aggregate
intrinsic
value
(millions)
Outstanding, beginning of year
 
19

 
$
58

 
 
 
 
Granted
 
3

 
76

 
 
 
 
Exercised
 
(6
)
 
56

 
 
 
 
Forfeitures and expirations
 
(1
)
 
67

 
 
 
 
Outstanding, end of year
 
15

 
$
62

 
7.0
 
$
172

Exercisable, end of year
 
8

 
$
58

 
5.8
 
$
133

Additionally, option activity for the comparable prior year periods is presented in the following table:
(millions, except per share data)
 
2015
 
2014
Outstanding, beginning of year
 
21

 
20

Granted
 
3

 
6

Exercised
 
(5
)
 
(4
)
Forfeitures and expirations
 
—

 
(1
)
Outstanding, end of year
 
19

 
21

Exercisable, end of year
 
10

 
10

Weighted-average exercise price:
 
 
 
 
Outstanding, beginning of year
 
$
56

 
$
54

Granted
 
64

 
60

Exercised
 
53

 
50

Forfeitures and expirations
 
60

 
58

Outstanding, end of year
 
$
58

 
$
56

Exercisable, end of year
 
$
55

 
$
53
Summary of Restricted Stock Summary [Table Text Block]
Employee restricted stock and restricted
stock units
 
Shares
(thousands)
 
Weighted-
average
grant-date
fair value
Non-vested, beginning of year
 
806

 
$
57

Granted
 
601

 
70

Vested
 
(116
)
 
56

Forfeited
 
(125
)
 
63

Non-vested, end of year
 
1,166

 
$
63

Additionally, restricted stock and restricted stock unit activity for 2015 and 2014 is presented in the following table:
Employee restricted stock and restricted stock units
 
2015
 
2014
Shares (in thousands):
 
 
 
 
Non-vested, beginning of year
 
346

 
318

Granted
 
617

 
114

Vested
 
(113
)
 
(65
)
Forfeited
 
(44
)
 
(21
)
Non-vested, end of year
 
806

 
346

Weighted-average exercise price:
 
 
 
 
Non-vested, beginning of year
 
$
54

 
$
52

Granted
 
59

 
56

Vested
 
50

 
51

Forfeited
 
58

 
53

Non-vested, end of year
 
$
57

 
$
54