Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Face (par) amount of debt instrument at time of issuance.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Weighted average interest rate of long-term debt outstanding.

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Amount of cash outflow to acquire Federal Home Loan Bank (FHLB) stock.

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Amount of cash inflow from sale of Federal Home Loan Bank (FHLB) stock.

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Borrowings (Narrative) (Details) - USD ($)	3 Months Ended
Borrowings (Narrative) (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016	Mar. 02, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized debt discounts/premiums and debt issuance costs	$ 29,000,000			$ 24,000,000
Weighted average interest rate on long-term debt	3.34%
FHLB stock sold	$ 64,000,000	$ 0
Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]
Senior Notes issued			$ 650,000,000
Fixed interest rate			3.20%
Commercial paper [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,500,000,000.0
Commercial paper	600,000,000			0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	750,000,000
FHLB [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Funds drawn under LOC's	0			$ 0
Schwab Bank [Member] \| FHLB [Member]
Debt Instrument [Line Items]
FHLB stock sold	$ 64,000,000	0
Purchase of FHLB stock		$ 0