Equity, Stock Related Disclosures (Details) (USD $)	0 Months Ended	12 Months Ended			2 Months Ended
	Jan. 23, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 20, 2015
Transactions in connection with stock-based compensation plans:
Treasury stock, ending balance		(159,202,872)	(137,932,138)
Equity (Textual)
Preferred stock, shares authorized		20,000,000
Preferred stock, par value per share		$ 0.01
Subsequent Event [Member] | Dividend Declared [Member]
Equity (Textual)
Dividends payable, date declared	Jan. 23, 2015
Dividends payable, amount per share	$ 0.40
Dividends payable, date to be paid	Mar. 03, 2015
Dividends payable, date of record	Feb. 11, 2015
Stock-Based Compensation Plans Repurchase Program [Member]
Equity (Textual)
Stock repurchases under buyback program		$ 128,000,000	$ 236,000,000	$ 153,000,000
Common Stock Repurchase Program [Member]
Equity (Textual)
Stock repurchases under buyback program		1,168,000,000	692,000,000	118,000,000
Approvals Under Program Two [Member]
Equity (Textual)
Authorized amount under stock purchase program		3,000,000,000
Remaining amount authorized under stock purchase programs		1,500,000,000
Approvals Under Program One [Member]
Equity (Textual)
Authorized amount under stock purchase program		6,000,000,000
Common Stock [Member]
Share Activity Rollforward
Common stock, beginning balance		673,000,000	673,000,000	673,000,000
Transactions in connection with stock-based compensation plans:
Stock issuances		0	0	0
Common stock, ending balance		673,000,000	673,000,000	673,000,000
Treasury Stock [Member]
Share Activity Rollforward
Treasury stock, beginning balance		(138,000,000)	(121,000,000)	(117,000,000)
Transactions in connection with stock-based compensation plans:
Stock issuances		4,000,000	6,000,000	6,000,000
Treasury stock, ending balance		(159,000,000)	(138,000,000)	(121,000,000)
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases		(2,000,000)	(6,000,000)	(6,000,000)
Equity (Textual)
Stock repurchases under buyback program		128,000,000	236,000,000	163,000,000
Stock repurchases		2,000,000	6,000,000	6,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases		(23,000,000)	(17,000,000)	(4,000,000)
Equity (Textual)
Stock repurchases under buyback program		1,168,000,000	692,000,000	118,000,000
Stock repurchases		23,000,000	17,000,000	4,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member] | Subsequent Event [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases					(1,000,000)
Equity (Textual)
Stock repurchases under buyback program					$ 57,000,000
Stock repurchases					1,000,000