Stockholders' Equity 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012
Stock Repurchase Program [Line Items]
Accelerated share repurchase, value		$ 500
Stockholders' Equity (Textual) [Abstract]
Number of initial shares received under accelerated share repurchase agreement		15
Number of additional shares received under accelerated share repurchase agreement	3.7
Total shares of common stock repurchased excluding ASR			13.5
Value of common stock repurchased excluding ASR			346
Remaining authorized amount of common stock under common stock repurchase program			654
Accumulated other comprehensive loss		108	118
Treasury Stock [Member]
Stock Repurchase Program [Line Items]
Accelerated share repurchase, value		375
Additional Paid-in Capital [Member]
Stock Repurchase Program [Line Items]
Accelerated share repurchase, value		125
Accelerated Share Repurchase Agreement [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program, authorized amount		$ 500