Stockholders' Equity 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Stock Repurchase Program [Line Items]
Accelerated share repurchase		$ 500
Stockholders' Equity (Textual) [Abstract]
Remaining authorized amount of common stock under common stock repurchase program	904
Number of additional shares received under accelerated share repurchase agreement	3.7
Accumulated other comprehensive loss	134	108
Number of initial shares received under accelerated share repurchase agreement		15
Total shares repurchased including ASR	3.8
Repurchase of common stock	96
Additional Paid-in Capital [Member]
Stock Repurchase Program [Line Items]
Accelerated share repurchase		125
Treasury Stock [Member]
Stock Repurchase Program [Line Items]
Accelerated share repurchase		375
Accelerated Share Repurchase Agreement [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program, authorized amount		$ 500