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Fair Value Measurements - Changes in balances of Level 3 financial liabilities carried at fair value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial liabilities, Beginning Balance $ (1,759) [1] $ (1,369) $ (3,861)
Impact of accounting change     2,701
Total realized/unrealized gains (losses) included in Net earnings (589) (211) (17)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0
Purchases and issuances (300) (277) (257)
Sales and settlements 106 98 65
Transfer into Level 3 0 0 0
Transfer out of Level 3 0 0 0
Sale of subsidiaries     0
Financial liabilities, Ending Balance (2,542) [2] (1,759) [1] (1,369)
Liabilities of MIE      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial liabilities, Beginning Balance   0 (2,701)
Impact of accounting change [3]     2,701
Total realized/unrealized gains (losses) included in Net earnings     0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)     0
Purchases and issuances     0
Sales and settlements     0
Transfer into Level 3     0
Transfer out of Level 3     0
Sale of subsidiaries     0
Financial liabilities, Ending Balance     0
Embedded derivatives      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial liabilities, Beginning Balance (1,759) (1,369) (1,160)
Impact of accounting change     0
Total realized/unrealized gains (losses) included in Net earnings (589) [4] (211) [5] (17) [6]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0
Purchases and issuances (300) (277) (257)
Sales and settlements 106 98 65
Transfer into Level 3 0 0 0
Transfer out of Level 3 0 0 0
Sale of subsidiaries     0
Financial liabilities, Ending Balance $ (2,542) $ (1,759) $ (1,369)
[1] As previously discussed, these tables exclude the portion of MIE liabilities allocated to Level 3, which are derived from the fair value of the MIE assets.
[2] As previously discussed, these tables exclude the portion of MIE liabilities allocated to Level 3, which are derived from the fair value of the MIE assets.
[3] The impact of implementing new guidance adopted in 2015, as discussed in Note A — “Accounting Policies — Managed Investment Entities.”
[4] Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects losses related to the unlocking of actuarial assumptions of $25 million in 2017.
[5] Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects losses related to the unlocking of actuarial assumptions of $17 million in 2016.
[6] Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects losses related to the unlocking of actuarial assumptions of $28 million in 2015.