Fair Value (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	$ 3	$ 35
Total finance receivables and loans, net	98,405	99,120
Nonmarketable equity securities	275	337
Deposit liabilities	56,851	53,350
Short-term borrowings	5,255	8,545
Long-term debt	67,299	69,465
Deferred interest for zero coupon bonds		359
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	0	0
Total finance receivables and loans, net	0	0
Nonmarketable equity securities	0	0
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	3	17
Total finance receivables and loans, net	0	0
Nonmarketable equity securities	245	308
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	26,945	31,067
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	0	18
Total finance receivables and loans, net	99,733	100,090
Nonmarketable equity securities	51	38
Deposit liabilities	57,371	54,070
Short-term borrowings	5,255	8,545
Long-term debt	43,233	42,297
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	3	35
Total finance receivables and loans, net	98,405	99,120
Nonmarketable equity securities	275	337
Deposit liabilities	56,851	53,350
Short-term borrowings	5,255	8,545
Long-term debt	67,299	69,824
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held-for-sale, net	3	35
Total finance receivables and loans, net	99,733	100,090
Nonmarketable equity securities	296	346
Deposit liabilities	57,371	54,070
Short-term borrowings	5,255	8,545
Long-term debt	$ 70,178	$ 73,364