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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2019
Mar. 31, 2019
Feb. 28, 2019
Mar. 31, 2015
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Investments, Debt and Securities [Line Items]                  
Trading securities         $ 254       $ 291
Net income from unconsolidated investees         17 $ 45      
OCC, Prior Period Results                  
Investments, Debt and Securities [Line Items]                  
Net income from unconsolidated investees   $ 36              
OCC                  
Investments, Debt and Securities [Line Items]                  
Net income from unconsolidated investees   $ 9              
Committed equity contribution       $ 150          
Capital contribution       $ 30          
Annual dividend from shareholders percentage       50.00%          
Annual dividend received             $ 13 $ 10  
Proceeds from contributed capital $ 16   $ 44            
Foreign Government Debt Securities                  
Investments, Debt and Securities [Line Items]                  
Trading securities         $ 160       $ 169