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Basis of Presentation (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Accounting Standards Update and Change in Accounting Principle [Abstract]  
Cumulative effect of new accounting standards $ 0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of new accounting standards 0
Adjustment Related to Underaccrued Payroll Tax Credits Included in Payroll support and other voluntary Employee programs, net  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Prior Period Reclassification Adjustment 88
Other comprehensive income (loss) other changes net of tax  
Accounting Standards Update and Change in Accounting Principle [Abstract]  
Cumulative effect of new accounting standards (31)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of new accounting standards (31)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (60) [1]
Accumulated other comprehensive income (loss)  
Accounting Standards Update and Change in Accounting Principle [Abstract]  
Cumulative effect of new accounting standards (19)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect of new accounting standards $ (19)
[1] Investment gains related to prior periods that were reclassified from AOCI into Other (gains) losses, net. See Note 1.