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INCOME TAXES - Total Income Tax Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Statements of earnings $ (1,585) $ 359 $ 332 $ 306 $ 402 $ 334 $ 286 $ 386 $ (586) $ 1,408 $ 1,329
Other comprehensive income (loss):                      
Unrealized foreign currency translation gains (losses) during period                 52 70 16
Unrealized gains (losses) on investment securities:                      
Unrealized holding gains (losses) on investment securities during period                 575 962 (931)
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings                 1 18 21
Unrealized gains (losses) on derivatives during period                 0 1 0
Pension liability adjustment during period                 3 (16) (7)
Total income tax expense (benefit) related to items of other comprehensive income (loss)                 631 1,035 (901)
Additional paid-in capital (exercise of stock options)                 0 (10) 4
Total income taxes                 $ 45 $ 2,433 $ 432