Employment Benefit Plans Plan Assets (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Accrued dividend and interest receivable	$ 1,000,000		$ 1,000,000
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,490,000,000	[1]	2,013,000,000	[2]
Pension Plan, Defined Benefit | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,300,000,000	[1],[3]	1,418,000,000	[2],[3]
Pension Plan, Defined Benefit | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	190,000,000	[1],[3]	563,000,000	[2],[3]
Pension Plan, Defined Benefit | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[1],[3]	32,000,000	[2],[3]	130,000,000
Pension Plan, Defined Benefit | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	16,000,000		13,000,000
Pension Plan, Defined Benefit | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	16,000,000	[3]	13,000,000	[3]
Pension Plan, Defined Benefit | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Registered investment companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	60,000,000		54,000,000
Pension Plan, Defined Benefit | Registered investment companies [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	60,000,000	[3]	54,000,000	[3]
Pension Plan, Defined Benefit | Registered investment companies [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Registered investment companies [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | US Government Agencies Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	10,000,000		13,000,000
Pension Plan, Defined Benefit | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	10,000,000	[3]	13,000,000	[3]
Pension Plan, Defined Benefit | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]	1,000,000
Pension Plan, Defined Benefit | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0		32,000,000
Pension Plan, Defined Benefit | Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	32,000,000	[3]	129,000,000
Pension Plan, Defined Benefit | Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,000,000		1,000,000
Pension Plan, Defined Benefit | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,000,000	[3]	1,000,000	[3]
Pension Plan, Defined Benefit | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	162,000,000		536,000,000
Pension Plan, Defined Benefit | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
Pension Plan, Defined Benefit | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	162,000,000	[3]	536,000,000	[3]
Pension Plan, Defined Benefit | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3]	0	[3]
UNITED STATES | Pension Plan, Defined Benefit | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,240,000,000	[4]	1,364,000,000	[5]
UNITED STATES | Pension Plan, Defined Benefit | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	2,240,000,000	[3],[4]	1,364,000,000	[3],[5]
UNITED STATES | Pension Plan, Defined Benefit | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	0	[3],[4]	0	[3],[5]
UNITED STATES | Pension Plan, Defined Benefit | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets Excluding Accrued Dividend And Interest Receivable	$ 0	[3],[4]	$ 0	[3],[5]

[1] Excludes less than $1 million accrued for dividend and interest receivable.

[2] Excludes $1 million accrued for dividend and interest receivable.

[3] See Note 2 to the Consolidated Financial Statements under the heading “Fair Value Measurements” for a definition of each of these levels of inputs.

[4] As of December 31, 2013, four U.S. equity securities each exceeded 10 percent of total plan assets. These investments represent approximately 62 percent of total plan assets.

[5] As of December 31, 2012, three U.S. equity securities each exceeded 10 percent of total plan assets. These investments represented approximately 45 percent of total plan assets.