NOTES PAYABLE - Summary of Notes Payable (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Debt Instrument [Line Items]
Notes payable	$ 6,282		$ 5,282
3.45% senior notes due August 2015
Debt Instrument [Line Items]
Notes payable	300		300
2.65% senior notes due February 2017
Debt Instrument [Line Items]
Notes payable	653	[1]	653	[1]
8.50% senior notes due May 2019
Debt Instrument [Line Items]
Notes payable	850		850
2.40% senior notes due March 2020
Debt Instrument [Line Items]
Notes payable	550		0
4.00% senior notes due February 2022
Debt Instrument [Line Items]
Notes payable	350	[2]	350	[2]
3.625% senior notes due June 2023
Debt Instrument [Line Items]
Notes payable	700		700
3.625% senior notes due November 2024
Debt Instrument [Line Items]
Notes payable	749	[2]	749	[2]
3.25% senior notes due March 2025
Debt Instrument [Line Items]
Notes payable	448	[2]	0
6.90% senior notes due December 2039
Debt Instrument [Line Items]
Notes payable	397	[2]	397	[2]
6.45% senior notes due August 2040
Debt Instrument [Line Items]
Notes payable	448	[2]	448	[2]
5.50% subordinated notes due September 2052
Debt Instrument [Line Items]
Notes payable	500		500
2.26% yen-denominated Uridashi notes due September 2016
Debt Instrument [Line Items]
Notes payable	67		66
1.84% yen-denominated Samurai notes due July 2016
Debt Instrument [Line Items]
Notes payable	131		131
3.60% yen-denominated loan due July 2015
Debt Instrument [Line Items]
Notes payable	83		83
3.00% yen-denominated loan due August 2015
Debt Instrument [Line Items]
Notes payable	42		41
Capitalized Lease Obligations
Debt Instrument [Line Items]
Notes payable	$ 14		$ 14

[1] Principal amount plus an issuance premium that is being amortized over the life of the notes

[2] Principal amount net of an issuance discount that is being amortized over the life of the notes