Fair Value (Recurring Measurements) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Debt securities:
Unsecured debentures	$ 260	[1]	$ 435	[1]
Certificates of deposit	72	[1]	151	[1]
Government debt securities	44	[1]	25	[1]
Subtotal	376	[1]	611	[1]
Equity securities:
Mutual funds	47	[1]	44	[1]
Subtotal	47	[1]	44	[1]
Total available-for-sale	423	[1]	655	[1]
Equity securities:
Mutual funds	15		13
Total trading	15		13
DERIVATIVES:
Total derivatives	212		240
TOTAL ASSETS	650		908
DERIVATIVES:
Total derivatives	502		371
TOTAL LIABILITIES	502		371
Interest rate derivatives [Member]
DERIVATIVES:
Total derivatives	22		98
DERIVATIVES:
Total derivatives	409		322
Cross currency derivatives [Member]
DERIVATIVES:
Total derivatives	0		5
DERIVATIVES:
Total derivatives	11		11
Foreign currency derivatives [Member]
DERIVATIVES:
Total derivatives	126		113
DERIVATIVES:
Total derivatives	39		21
Commodity derivatives [Member]
DERIVATIVES:
Total derivatives	64		24
DERIVATIVES:
Total derivatives	43		17
Level 1 [Member]
Debt securities:
Unsecured debentures	0	[1]	0	[1]
Certificates of deposit	0	[1]	0	[1]
Government debt securities	0	[1]	0	[1]
Subtotal	0	[1]	0	[1]
Equity securities:
Mutual funds	0	[1]	0	[1]
Subtotal	0	[1]	0	[1]
Total available-for-sale	0	[1]	0	[1]
Equity securities:
Mutual funds	15		13
Total trading	15		13
DERIVATIVES:
Total derivatives	0		0
TOTAL ASSETS	15		13
DERIVATIVES:
Total derivatives	0		0
TOTAL LIABILITIES	0		0
Level 1 [Member] | Interest rate derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 [Member] | Cross currency derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 [Member] | Foreign currency derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 [Member] | Commodity derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 2 [Member]
Debt securities:
Unsecured debentures	260	[1]	435	[1]
Certificates of deposit	72	[1]	151	[1]
Government debt securities	44	[1]	25	[1]
Subtotal	376	[1]	611	[1]
Equity securities:
Mutual funds	47	[1]	44	[1]
Subtotal	47	[1]	44	[1]
Total available-for-sale	423	[1]	655	[1]
Equity securities:
Mutual funds	0		0
Total trading	0		0
DERIVATIVES:
Total derivatives	84		136
TOTAL ASSETS	507		791
DERIVATIVES:
Total derivatives	314		263
TOTAL LIABILITIES	314		263
Level 2 [Member] | Interest rate derivatives [Member]
DERIVATIVES:
Total derivatives	22		98
DERIVATIVES:
Total derivatives	226		221
Level 2 [Member] | Cross currency derivatives [Member]
DERIVATIVES:
Total derivatives	0		5
DERIVATIVES:
Total derivatives	11		11
Level 2 [Member] | Foreign currency derivatives [Member]
DERIVATIVES:
Total derivatives	15		15
DERIVATIVES:
Total derivatives	35		16
Level 2 [Member] | Commodity derivatives [Member]
DERIVATIVES:
Total derivatives	47		18
DERIVATIVES:
Total derivatives	42		15
Level 3 [Member]
Debt securities:
Unsecured debentures	0	[1]	0	[1]
Certificates of deposit	0	[1]	0	[1]
Government debt securities	0	[1]	0	[1]
Subtotal	0	[1]	0	[1]
Equity securities:
Mutual funds	0	[1]	0	[1]
Subtotal	0	[1]	0	[1]
Total available-for-sale	0	[1]	0	[1]
Equity securities:
Mutual funds	0		0
Total trading	0		0
DERIVATIVES:
Total derivatives	128		104
TOTAL ASSETS	128		104
DERIVATIVES:
Total derivatives	188		108
TOTAL LIABILITIES	188		108
Level 3 [Member] | Interest rate derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	183		101
Level 3 [Member] | Cross currency derivatives [Member]
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 3 [Member] | Foreign currency derivatives [Member]
DERIVATIVES:
Total derivatives	111		98
DERIVATIVES:
Total derivatives	4		5
Level 3 [Member] | Commodity derivatives [Member]
DERIVATIVES:
Total derivatives	17		6
DERIVATIVES:
Total derivatives	$ 1		$ 2

[1] Amortized cost approximated fair value at June 30, 2014 and December 31, 2013.