Fair Value Measurements (Schedule of Financial Instruments Measured at Other Than Fair Value) (Details) - USD ($) $ in Millions		Dec. 31, 2020		Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities	[1]	$ 269		$ 274
Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Short-term Investments Fair Value Disclosure		2,200
Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities	[1],[2]	269	[3]	274
Level 1 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Short-term Investments Fair Value Disclosure		2,200
Level 2 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Short-term Investments Fair Value Disclosure		0
Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Short-term Investments Fair Value Disclosure		0
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		269		274
Net loan receivables		91,200		96,094
Cash and cash equivalents	[4]	13,564		6,924
Restricted cash	[4]	25		40
Accrued interest receivables	[4],[5]	992		1,044
Time deposits	[6]	29,090		34,910
Long-term borrowings		22,342		26,572
Accrued interest payables	[4],[5]	233		283
Estimate of Fair Value Measurement | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,924		14,383
Estimate of Fair Value Measurement | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		11,418		12,189
Estimate of Fair Value Measurement | Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		269		274
Estimate of Fair Value Measurement | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0		0
Net loan receivables		0		0
Cash and cash equivalents	[4]	13,564		6,924
Restricted cash	[4]	25		40
Accrued interest receivables	[4],[5]	0		0
Time deposits	[6]	0		0
Long-term borrowings		0		0
Accrued interest payables	[4],[5]	0		0
Estimate of Fair Value Measurement | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0		0
Estimate of Fair Value Measurement | Level 1 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0		0
Estimate of Fair Value Measurement | Level 1 [Member] | Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0		0
Estimate of Fair Value Measurement | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		269		274
Net loan receivables		0		0
Cash and cash equivalents	[4]	0		0
Restricted cash	[4]	0		0
Accrued interest receivables	[4],[5]	992		1,044
Time deposits	[6]	29,090		34,910
Long-term borrowings		22,212		26,400
Accrued interest payables	[4],[5]	233		283
Estimate of Fair Value Measurement | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,794		14,211
Estimate of Fair Value Measurement | Level 2 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		11,418		12,189
Estimate of Fair Value Measurement | Level 2 [Member] | Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		269		274
Estimate of Fair Value Measurement | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0		0
Net loan receivables		91,200		96,094
Cash and cash equivalents	[4]	0		0
Restricted cash	[4]	0		0
Accrued interest receivables	[4],[5]	0		0
Time deposits	[6]	0		0
Long-term borrowings		130		172
Accrued interest payables	[4],[5]	0		0
Estimate of Fair Value Measurement | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		130		172
Estimate of Fair Value Measurement | Level 3 [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		0		0
Estimate of Fair Value Measurement | Level 3 [Member] | Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		0		0
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		260		272
Net loan receivables		82,223		92,511
Cash and cash equivalents	[4]	13,564		6,924
Restricted cash	[4]	25		40
Accrued interest receivables	[4],[5]	992		1,044
Time deposits	[6]	28,269		34,381
Long-term borrowings		21,241		25,701
Accrued interest payables	[4],[5]	233		283
Carrying Value [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Short-term Investments Fair Value Disclosure		2,200
Carrying Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,840		14,284
Carrying Value [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings		10,401		11,417
Carrying Value [Member] | Residential Mortgage Backed Securities - Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity investment securities		$ 260		$ 272

[1] Held-to-maturity investment securities are reported at amortized cost.

[2] Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company’s community reinvestment initiatives.

[3] Maturities of residential mortgage-backed securities are reflective of the contractual maturities of the investment.

[4] The carrying values of these assets and liabilities approximate fair value due to their short-term nature.

[5] Accrued interest receivable and payable carrying values are presented as part of other assets or accrued expenses and other liabilities, respectively, in the Company’s consolidated statements of financial condition.

[6] Excludes deposits without contractually defined maturities for all periods presented.