Fair Value (Recurring Measurements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt securities:
Unsecured debentures	$ 435	[1]	$ 448	[1]
Certificates of deposit	151	[1]	143	[1]
Government debt securities	25	[1]	34	[1]
Subtotal	611	[1]	625	[1]
Equity securities:
Mutual funds	44	[1]	56	[1]
Subtotal	44	[1]	56	[1]
Total available-for-sale	655	[1]	681	[1]
Equity securities:
Mutual funds	13		12
Total trading	13		12
DERIVATIVES:
Total derivatives	240		100
TOTAL ASSETS	908		793
DERIVATIVES:
Total derivatives	371		602
TOTAL LIABILITIES	371		602
Interest rate derivatives
DERIVATIVES:
Total derivatives	98		2
DERIVATIVES:
Total derivatives	322		565
Cross Currency
DERIVATIVES:
Total derivatives	5		6
DERIVATIVES:
Total derivatives	11		6
Foreign currency derivatives
DERIVATIVES:
Total derivatives	113		81
DERIVATIVES:
Total derivatives	21		14
Commodity
DERIVATIVES:
Total derivatives	24		11
DERIVATIVES:
Total derivatives	17		17
Level 1
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	13		12
Total trading	13		12
DERIVATIVES:
Total derivatives	0		0
TOTAL ASSETS	13		12
DERIVATIVES:
Total derivatives	0		0
TOTAL LIABILITIES	0		0
Level 1 | Interest rate derivatives
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 | Cross Currency
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 | Foreign currency derivatives
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 1 | Commodity
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 2
Debt securities:
Unsecured debentures	435	[1]	448	[1]
Certificates of deposit	151	[1]	143	[1]
Government debt securities	25	[1]	34	[1]
Subtotal	611	[1]	625	[1]
Equity securities:
Mutual funds	44	[1]	56	[1]
Subtotal	44	[1]	56	[1]
Total available-for-sale	655	[1]	681	[1]
Equity securities:
Mutual funds	0		0
Total trading	0		0
DERIVATIVES:
Total derivatives	136		18
TOTAL ASSETS	791		699
DERIVATIVES:
Total derivatives	263		179
TOTAL LIABILITIES	263		179
Level 2 | Interest rate derivatives
DERIVATIVES:
Total derivatives	98		2
DERIVATIVES:
Total derivatives	221		153
Level 2 | Cross Currency
DERIVATIVES:
Total derivatives	5		6
DERIVATIVES:
Total derivatives	11		6
Level 2 | Foreign currency derivatives
DERIVATIVES:
Total derivatives	15		2
DERIVATIVES:
Total derivatives	16		7
Level 2 | Commodity
DERIVATIVES:
Total derivatives	18		8
DERIVATIVES:
Total derivatives	15		13
Level 3
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	104		82
TOTAL ASSETS	104		82
DERIVATIVES:
Total derivatives	108		423
TOTAL LIABILITIES	108		423
Level 3 | Interest rate derivatives
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	101		412
Level 3 | Cross Currency
DERIVATIVES:
Total derivatives	0		0
DERIVATIVES:
Total derivatives	0		0
Level 3 | Foreign currency derivatives
DERIVATIVES:
Total derivatives	98		79
DERIVATIVES:
Total derivatives	5		7
Level 3 | Commodity
DERIVATIVES:
Total derivatives	6		3
DERIVATIVES:
Total derivatives	$ 2		$ 4

[1] Amortized cost approximated fair value at December 31, 2013 and 2012.