Summary of Notes Payable (Detail) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Notes payable	$ 3,048		$ 3,038
8.50% senior notes due May 2019
Debt Instrument [Line Items]
Notes payable	850		850
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable	448	[1]	448	[1]
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable	396	[2]	396	[2]
3.45% senior notes due August 2015
Debt Instrument [Line Items]
Notes payable	300		300
1.52% yen-denominated Uridashi notes due September 2011
Debt Instrument [Line Items]
Notes payable	186		184
2.26% yen-denominated Uridashi notes due September 2016
Debt Instrument [Line Items]
Notes payable	99		98
Variable interest rate yen-denominated Uridashi notes due September 2011
Debt Instrument [Line Items]
Notes payable	248		245
1.87% yen-denominated Samurai notes due June 2012
Debt Instrument [Line Items]
Notes payable	329		327
3.60% yen-denominated loan due July 2015
Debt Instrument [Line Items]
Notes payable	124		123
3.00% yen-denominated loan due August 2015
Debt Instrument [Line Items]
Notes payable	62		61
Capitalized Lease Obligations
Debt Instrument [Line Items]
Notes payable	$ 6		$ 6

[1] $450 issuance net of a $2 underwriting discount that is being amortized over the life of the notes

[2] $400 issuance net of a $4 underwriting discount that is being amortized over the life of the notes