Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financial Assets [Abstract]
Notes receivable for the issuance of common stock	$ 1	$ 23
Mortgage loans	518	508
Financial Liabilities [Abstract]
Short term debt	549	549
Long term debt	2,558	2,011
Carrying Amount [Member]
Financial Assets [Abstract]
Notes receivable for the issuance of common stock	1	23
Mortgage loans	518	508
Financial Liabilities [Abstract]
Premium deposits and annuity contracts		57
Short term debt	549	549
Long term debt	2,558	2,011
Estimated Fair Value [Member]
Financial Assets [Abstract]
Notes receivable for the issuance of common stock	1	23
Mortgage loans	540	515
Financial Liabilities [Abstract]
Premium deposits and annuity contracts		58
Short term debt	563	575
Long term debt	2,947	2,328
Level 1 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Notes receivable for the issuance of common stock
Mortgage loans
Financial Liabilities [Abstract]
Premium deposits and annuity contracts
Short term debt
Long term debt
Level 2 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Notes receivable for the issuance of common stock
Mortgage loans
Financial Liabilities [Abstract]
Premium deposits and annuity contracts
Short term debt	563	575
Long term debt	2,947	2,328
Level 3 [Member] | Estimated Fair Value [Member]
Financial Assets [Abstract]
Notes receivable for the issuance of common stock	1	23
Mortgage loans	540	515
Financial Liabilities [Abstract]
Premium deposits and annuity contracts		58
Short term debt
Long term debt