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Summary of Significant Accounting Policies - Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net Income Available to Common Stockholders $ 119 $ 2,190 $ 1,481
Less: Net Income Allocated to Restricted stock awards $ (13) $ (12) $ (8)
Basic Weighted Average Common Shares Outstanding 2,263 2,264 2,216
Basic Earnings Per Common Share $ 0.05 $ 0.96 $ 0.66
Unvested restricted stock awards      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Antidilutive securities 13 13 12
Convertible trust preferred securities      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Antidilutive securities 3 3 3
Mandatory convertible preferred stock(a)      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Antidilutive securities 0 0 48
Class P      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net Income Available to Common Stockholders $ 106 $ 2,178 $ 1,473
Class P | Unvested restricted stock awards      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Awards outstanding 13