Reinsurance - Reinsurance Recoverables (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Ceded Credit Risk [Line Items]
Reinsurance recoverables	$ 7,132	$ 7,299
Guaranteed Minimum Income Benefit [Member]
Ceded Credit Risk [Line Items]
Number of external reinsurers	3	3
Guaranteed Minimum Death Benefits (GMDB) [Member] | Berkshire Hathway Life Insurance Company Of Nebraska [Member] | Guaranteed Minimum Death Benefit [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	1,195	1,276
Guaranteed Minimum Death Benefits (GMDB) [Member] | Berkshire Hathway Life Insurance Company Of Nebraska [Member] | Guaranteed Minimum Death Benefit [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables percentage of total	100.00%
Guaranteed Minimum Death Benefits (GMDB) [Member] | Other Retrocessionaires [Member] | Guaranteed Minimum Death Benefit [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	40	41
Guaranteed Minimum Death Benefits (GMDB) [Member] | Other Retrocessionaires [Member] | Guaranteed Minimum Death Benefit [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables percentage of total	97.00%
Individual Life Insurance And Annuity [Member] | The Lincoln National Life Insurance Company And Lincoln Life And Annuity Of New York [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	3,855	3,905
Retirement Benefits [Member] | Prudential Retirement Insurance And Annuity Company [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	1,148	1,200
Retirement Benefits [Member] | Prudential Retirement Insurance And Annuity Company [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables percentage of total	100.00%
Supplemental Benefits business (resulting from the acquistion) [Member] | Great American Life Insurance Company [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	344	363
Supplemental Benefits business (resulting from the acquistion) [Member] | Great American Life Insurance Company [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables percentage of total	100.00%
Ongoing Operations [Member] | Other Retrocessionaires [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	444	407
Number of external reinsurers	80
Maximum reinsurance recoverable from a single reinsurer.	70
Reinsurance recoverables percentage of total	12.00%
Ongoing Operations [Member] | Other Retrocessionaires [Member] | Maximum [Member]
Ceded Credit Risk [Line Items]
Minimum reinsurance recoverable balance from a single reinsurer	1
Other run-off reinsurance [Member] | Other Retrocessionaires [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables	106	107
Other run-off reinsurance [Member] | Other Retrocessionaires [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables percentage of total	89.00%
GMIB Assets (reported in Other Assets) [Member] | Berkshire Hathway Life Insurance Company Of Nebraska [Member] | Guaranteed Minimum Income Benefit [Member]
Ceded Credit Risk [Line Items]
GMIB Assets (reported in Other Assets)	401	352
GMIB Assets (reported in Other Assets) [Member] | Berkshire Hathway Life Insurance Company Of Nebraska [Member] | Guaranteed Minimum Income Benefit [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
GMIB Assets percentage of total	100.00%
GMIB Assets (reported in Other Assets) [Member] | Other Retrocessionaires [Member] | Guaranteed Minimum Income Benefit [Member]
Ceded Credit Risk [Line Items]
GMIB Assets (reported in Other Assets)	$ 462	$ 399
Number of external reinsurers	2
GMIB Assets (reported in Other Assets) [Member] | Other Retrocessionaires [Member] | Guaranteed Minimum Income Benefit [Member] | Ceded Credit Risk Secured [Member]
Ceded Credit Risk [Line Items]
GMIB Assets percentage of total	40.00%