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Schedule I Condensed Statement of Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Investment and other income $ 1,502 $ 1,886 $ 1,376
Total revenues 257,141 242,155 226,247
Operating costs:      
Interest expense 1,663 1,704 1,400
Total operating costs 234,736 222,470 208,903
Loss before income taxes 20,742 17,981 15,944
Benefit for income taxes 4,973 3,742 3,562
Net earnings 15,403 13,839 11,986
Other comprehensive (loss) income (236) 582 (1,517)
Comprehensive income 15,167 14,421 10,469
Parent Company [Member]      
Revenues:      
Investment and other income 194 209 194
Total revenues 194 209 194
Operating costs:      
Operating costs 27 38 35
Interest expense 1,594 1,580 1,285
Total operating costs 1,621 1,618 1,320
Loss before income taxes (1,427) (1,409) (1,126)
Benefit for income taxes 300 293 251
Loss of parent company (1,127) (1,116) (875)
Equity in undistributed income of subsidiaries 16,530 14,955 12,861
Net earnings 15,403 13,839 11,986
Other comprehensive (loss) income (236) 582 (1,517)
Comprehensive income $ 15,167 $ 14,421 $ 10,469